Practice Test

Q1) The pattern of inheritance of white eye colour in Drosophila that the gene is: Show Answer

Q2) A haemophilic man marries a normal homozygous woman. What is the probability that their son will be haemophilic? Show Answer

Q3) A man known to be victim of haemophilia marries a normal woman whose father known to be a bleeder, then it may be expected that: Show Answer

Q4) Sex-linked inheritance can be known from: Show Answer

Q5) Evidence that crossing over occurs at four strand stage comes from: Show Answer

Q6) Twenty two pairs of similar human chromosomes are called: Show Answer

Q7) Relative morphologies of chromosomes of an individual indicate his/her: Show Answer

Q8) Segregation of hereditary factor occur during the process of: Show Answer

Q9) Crossing over may result into: Show Answer

Q10) During meiosis the exchange of chromosomal segments between maternal and paternal chromatids is known as: Show Answer

Q11) The points where the crossing over takes place between chromatids of two homologous chromosomes of a pair are: Show Answer

Q12) If the two genes for two different traits are located on the same chromosome, and inherited together they are termed as: Show Answer

Q13) Who proposed the 'Fibre folded Model' of chromosome structure? Show Answer

Q14) After examining the blood groups of a couple, the doctor has advised them not to have more than one child. The blood group of the couple are likely to be: Show Answer

Q15) Usually the recessive character is expressed only when present in double recessive condition. However, single recessive gene can express itself in human beings when the gene present on: Show Answer

Q16) Marriage between blood relations or cousins should not be performed, because: Show Answer

Q17) More the distance between the two genes on a chromosome: Show Answer

Q18) A linkage group is explained as: Show Answer

Q19) Plotting of specific location of genes on the chromosome is known as: Show Answer

Q20) Complete linkage is observed in: Show Answer

Q21) Most acceptable theory for crossing over is: Show Answer

Q22) The percentage of crossing over will be more if: Show Answer

Q23) In Drosophila, a fly whose one half of the body is male and the other half female, referred to as: Show Answer

Q24) Crossing over takes place between: Show Answer

Q25) X and Y chromosomes determine sex was discovered by: Show Answer

Q26) Which of the following is not heritable? Show Answer

Q27) The process of mating of individuals closely related than the average of population of which they belong is called: Show Answer

Q28) A pair of contrasting characters located on the homologous chromosome, are termed as: Show Answer

Q29) Drosophila has four pairs of chromosomes. How many linkage groups does it have? Show Answer

Q30) Linkage in Drosophila was first discovered by: Show Answer

Q31) Sex chromosomes may be defined as: Show Answer

Q32) A species of Neurospora which can grow on a single minimal medium is known as: Show Answer

Q33) A single Drosophila chromosome possesses a gene for red eyes and a gene for straight wings. These genes may be separated as a result of: Show Answer

Q34) As a result of linkage and crossing over: Show Answer

Q35) When, a green plant was self fertilized, the progeny had 209 green seedlings and 14 white seedlings. The above results indicated that: Show Answer

Q36) The genes which tend to be inherited together are said to be: Show Answer

Q37) If a child's father is colourblind and the mother has one gene for colourblindness, the probaility that the child may be colour blind will be: Show Answer

Q38) Low temperature is mutagenic in: Show Answer

Q39) Sum total of all the genetic information in the breeding members of a population at a time is known as: Show Answer

Q40) Lethal genes are those which: Show Answer

Q41) The traits controlled by gene located on X chromosome are said to be: Show Answer

Q42) Which of the following is wholly a genetic trait in man? Show Answer

Q43) A gene located on Y chromosome and therefore transmitted from father to son is known as: Show Answer

Q44) Multiple alleles are: Show Answer

Q45) In Mirabilis normal leaves
(A) and variegated leaves (B) occur in different plants. If (B) male is crossed with (A), female normal leaves occur in the hybrid. But if (A) male is crossed with (B) female, variegated leaves occur. It is an instance of: Show Answer

Q46) In a large number of crosses of two heterozygous round and yellow seeded pea plants, the fractions of offspring that would probably appear wrinkled and green is: Show Answer

Q47) Of the following, gene maps can best be constructed on the basis of the study of: Show Answer

Q48) Reassortment occurs as a consequence of random orientation of pairs of homologous chromosome at: Show Answer

Q49) Which one of the following statement is incorrect? Linkage: Show Answer

Q50) Maize has 10 pairs of chromosomes. Linkage groups present in it are: Show Answer

Q51) Number of strands in each chromosome pair during crossing over is: Show Answer

Q52) Gene order: Show Answer

Q53) If there is a large percentage of crossing over between genes A and B, the explanation is that the genes are located / converted: Show Answer

Q54) The rare appearance of a white eyed female or a red eyed male in a cross between a white eyed female Drosophila and a red eyed male, may best be attributed to which one of the following? Show Answer

Q55) The frequency of mutation: Show Answer

Q56) A pleiotropic mutation: Show Answer

Q57) The mutation in germ cells: Show Answer

Q58) Neurospora is more suitable for genetic studies because: Show Answer

Q59) Mutation brings about: Show Answer

Q60) Most of the mutations are: Show Answer

Q61) Mutagens are: Show Answer

Q62) The reason why some mutations which are harmful do not get eliminated from the gene pool is that: Show Answer

Q63) The person who used X-rays to cause mutation was: Show Answer

Q64) Mutation do not result in: Show Answer

Q65) Mutations which are not dominant are not lost by a gene pool. It is known as: Show Answer

Q66) Which are necessary conditions for the Hardy Weinberg principle for applying to genetic population? Show Answer

Q67) Which of the following support the idea that mutational changes have been more frequent at the time when living cells were first evolved: Show Answer

Q68) The process of deletion and transfer of several genes is: Show Answer

Q69) The term mutation has been given by: Show Answer

Q70) Nutritional mutants were first isolated by: Show Answer

Q71) The mutations which prove fatal for the organism are called: Show Answer

Q72) Genetic variability in sexually reproducing plants is caused by: Show Answer

Q73) Perceptible change in the phenotype of an organism is brought about by: Show Answer

Q74) Genetic mutation occurs in: Show Answer

Q75) A wild organism (bacterium) that will grow on a minimal medium is known as: Show Answer

Q76) A mutant organism (bacterium) that will not grow on a minimal medium but does so on addition of some growth factors is known as: Show Answer

Q77) Gibberish mutation is caused by: Show Answer

Q78) Hereditary variation in plants have been obtained through the use of: Show Answer

Q79) A normal girl whose father was albino marries a man who is albino what ratio of normal and albino can be expected among their offspring? Show Answer

Q80) The rate of mutation can be increased by: Show Answer

Q81) In nature the rate of mutation is: Show Answer

Q82) The smallest element or sub-division of a gene which can be affected by a mutation is: Show Answer

Q83) Organic evolution due to large discontinuous variation was proposed by: Show Answer

Q84) Segment of DNA having ACC, GAC, AGC, CGC, ACA and AAA lost first base due to deletion. The effect is: Show Answer

Q85) New varieties of crop plants are produced through: Show Answer

Q86) How are new characteristics produced in plants? Show Answer

Q87) Mutations are caused by: Show Answer

Q88) Point mutations affect DNA's: Show Answer

Q89) To be of evolutionary importance, mutation must occur at the level of: Show Answer

Q90) The gene which increases the frequency of mutation in other genes is referred to as: Show Answer

Q91) Haemolytic jaundice is caused due to a dominant gene but only 10 per cent of the people actually develop the disease. A heterozygous man marries a homozygous normal woman. What proportion of the children would be expected to develop the haemolytic disease? Show Answer

Q92) Chemical mutagens are far more hazardous to man than radiation because: Show Answer

Q93) There is no masking of expression of genes in Neurospora because: Show Answer

Q94) The research in human genetics established in 1901 has been slow because: Show Answer

Q95) Inborn errors of metabolism in human beings were first studied by: Show Answer

Q96) Who coined the term Eugenics? Show Answer

Q97) The basic approaches to human genetics are: Show Answer

Q98) If brown eye character is dominant over blue eye, the parent being blue eyed, what is the percentage chance of getting brown eyed child: Show Answer

Q99) The packing (compaction) ratio of a metaphasic chromosome is: Show Answer

Q100) A doctor's son: Show Answer

Q101) The creation of mutation is called: Show Answer

Q102) Arrangement of chromosomes in the order of decreasing length is termed: Show Answer

Q103) Second baby will be born dead if: Show Answer

Q104) Syndrome due to extra 18th autosomal chromosome is known as: Show Answer

Q105) D-group chromosomes are: Show Answer

Q106) When hybrid is superior to its parents, it is termed: Show Answer

Q107) Number of sex linked disorders discovered so far in human being are: Show Answer

Q108) The human chromosomes are divided into 7 groups, B-group chromosomes are: Show Answer

Q109) Male human having breast like females, sterility, degenerating seminiferous tubules, mental retardation are known as: Show Answer

Q110) When linked characters or genes are inherited together through two or more generations, it is called as: Show Answer

Q111) Ancestral history of an individual indicate his / her: Show Answer

Q112) In mongolism a patient possesses: Show Answer

Q113) The number of Barr-bodies in Turner's syndrome is: Show Answer

Q114) When number of Y spots is 2 in Klinefelter's syndrome sex chromosome complement is: Show Answer

Q115) Individual with more than two sets of chromosomes show many: Show Answer

Q116) Presence of extra finger or toe known as: Show Answer

Q117) Turner's syndrome is characterised by: Show Answer

Q118) The human beings having XXY or XXXY chromosomes develop: Show Answer

Q119) Individuals with Klinefelter's syndrome are characterised by: Show Answer

Q120) The characteristic symptoms resulting from various chromosomal abnormalities are called: Show Answer

Q121) The chormosomal abnormality due to the presence of one abnormal 21 st chromosome (Total 47) in man is called: Show Answer

Q122) Female with how many Barr bodies is normal: Show Answer

Q123) The chromosomal abnormality due to the presence of one additional 13th chromosome in man is: Show Answer

Q124) Which disorder is not hereditary? Show Answer

Q125) Protoplast fusion or parasexual hybridization was first done between man and mouse cells by: Show Answer

Q126) Whenever expression of a trait is limited to one sex, it is known as: Show Answer

Q127) Red green colour blindness is known as: Show Answer

Q128) Genic balance theory was proposed by: Show Answer

Q129) Males are XO and females XX in case of: Show Answer

Q130) If the female is carrier and male normal, what percentage of female offspring will be haemophilic: Show Answer

Q131) Sickle cell anaemia is due to: Show Answer

Q132) A male child would be born to parents if: Show Answer

Q133) A man heterozygous for sickle cell anaemia will show in his blood: Show Answer

Q134) The inheritance of sickle cell anaemia disease, the gene which cause this disease has a lethal effect when present in: Show Answer

Q135) The ratio between carrier, disease free and diseased individual on marriage between two carriers of sickle cell anaemia will be: Show Answer

Q136) What would be the ratio between colour blind and normal individuals in 2nd generation-progeny of colour blind man and normal woman? Show Answer

Q137) Philadelphia chromosome is reported in patients suffering from: Show Answer

Q138) The ratio between colour blind and normal sons colour blind and normal daughters in 2nd generation on marriage between a colour blind female and a normal male will be: Show Answer

Q139) Children of colour blind mother and a normal father would be: Show Answer

Q140) Which of the following blood groups is a universal recipient? Show Answer

Q141) Which of the following blood groups is a universal donor? Show Answer

Q142) Rh-negative individuals are: Show Answer

Q143) If one of the parents is of 'A' blood group and the other O, their progeny possibly represents: Show Answer

Q144) A person with blood group Rh - ve type A, may safely donate blood to a person whose blood is: Show Answer

Q145) If the mother has Rh - ve blood and the developing embryo has Rh - ve blood, the mother's blood would most likely: Show Answer

Q146) Identical twins come from: Show Answer

Q147) I. Q. (Intelligence quotient) is calculated by dividing: Show Answer

Q148) Polyploidy was discovered by: Show Answer

Q149) A dominant sex linked gene is known to cause baldness in men but no effect in women. What proportation of male offspring from heterozygous parents will be bald? Show Answer

Q150) Parasexual hybridisation means fusion between: Show Answer

Q151) The fusion between related species is referred to as: Show Answer

Q152) Haemophilia is caused due to lack of: Show Answer

Q153) Raphanobrassica is cross between: Show Answer

Q154) Knowing that Albinism is determined by a recessive gene in the children born to a normal couple prove that: Show Answer

Q155) In human being the sex of the child is differentiated and can be determined with 95% confidence by studying: Show Answer

Q156) Phenylketonuria is a genetic disease which refers to: Show Answer

Q157) The presence of tail in human child at birth is an example of: Show Answer

Q158) The genotype of Drosophila individual having sexual characters of female is: Show Answer

Q159) A family has five girls and no son. Probability of son in the 6th child will be: Show Answer

Q160) Human female has 44 + XX chromosomes in somatic cells. How many chromosomes will be present in secondary oocyte: Show Answer

Q161) Frequency of Down's syndrome is increased with: Show Answer

Q162) The unit of distance between genes on the chromosome is: Show Answer

Q163) The probability of a cross over between two gene loci is proportional to: Show Answer

Q164) With respect to the type of haemoglobin produced, the gene for sickle cell trait in human beings is: Show Answer

Q165) Which prevent union of chromosomes? Show Answer

Q166) Which of the following chromosomes are typically banded? Show Answer

Q167) Datura is classial example of: Show Answer

Q168) Concept of Mapping was first suggested by: Show Answer

Q169) When sex is determined before fertilization: Show Answer

Q170) An abnormal human male phenotype involving an extra X chromosome (XXY) is a case of: Show Answer

Q171) Each chromosome at the anaphase stage of a bone marrow cell in our body has: Show Answer

Q172) Barr body in mammals present: Show Answer

Q173) The polytene chromosomes were discovered for the first time in: Show Answer

Q174) The point at which the polytene chromosomes appear to be attached together is known as: Show Answer

Q175) The complete haploid set of chromosomes in each nucleus of a given species is referred to as the: Show Answer

Q176) Genes for antibiotic resistance are located on: Show Answer

Q177) The chromosome puffs on salivary gland chromosomes are: Show Answer

Q178) If the haploid number of chromosomes in a cell is 12, the monosomic number will be: Show Answer

Q179) Bacterial chromosome has: Show Answer

Q180) Which of the following blood groups are dominant? Show Answer

Q181) A nucleosome contains the following group of histone proteins: Show Answer

Q182) The term heterochromatin was coined by: Show Answer

Q183) A mother with blood group B has a child with blood group O, what will be the genotype of the father: Show Answer

Q184) Which of the following XY combination is associated with features of Klinefelter syndrome: Show Answer

Q185) How many linkage groups are present in man? Show Answer

Q186) Plastid has been acting as hereditary particles in cytoplasmic inheritance, was told by: Show Answer

Q187) Haemophilia is due to: Show Answer

Q188) Muton is called: Show Answer

Q189) Solenoid model explains the: Show Answer

Q190) Number of base pairs in a nucleosome is about: Show Answer

Q191) Genes are absent on: Show Answer

Q192) Drosophila has how many pairs of chromosomes? Show Answer

Q193) Chromosomes replicate at: Show Answer

Q194) Counting of chromosomes can be done at: Show Answer

Q195) Males of which animals have chromosomes less than in females: Show Answer

Q196) Males are haploid whereas females are diploid in: Show Answer

Q197) Chromosomes were first observed by: Show Answer

Q198) The term chromosomes was given by: Show Answer

Q199) Sudden heritable changes occur naturally in organisms was stated by: Show Answer

Q200) Who porposed the theory of mutation? Show Answer

Q201) Haemophilia is due to: Show Answer

Q202) Haemophilia is: Show Answer

Q203) Movement of gene to a non-homologous chromosome is called as: Show Answer

Q204) Normally mutations are: Show Answer

Q205) Mutations which alter the phenotypes slightly are: Show Answer

Q206) Gene is: Show Answer

Q207) Genome is called: Show Answer

Q208) Chimera is produced due to: Show Answer

Q209) Allopolyploids have: Show Answer

Q210) Phenylketonuria is: Show Answer

Q211) Haemophilia A is due to deficiency of clotting factor: Show Answer

Q212) Chromosomes X was first observed by: Show Answer

Q213) Protanopia is: Show Answer

Q214) Deuteranopia is: Show Answer

Q215) Sex limited genes are present in: Show Answer

Q216) The idiogram of C group of human chromosomes are: Show Answer

Q217) Plasmids in bacteria include: Show Answer

Q218) Trisomy (2n + 1) in Datura (Jimson weed) was first studied by a geneticist who also coined the term polyploidy: Show Answer

Q219) An organism or cell having a chromosome number exactly multiple of haploid number is known as: Show Answer

Q220) Haemophilia is more common in males because it is a: Show Answer

Q221) Bar eye in Drosophila is due to: Show Answer

Q222) Normally all genes occur in pairs but some genes occupying position on the X chromosome having no alleles on Y chromosome. This indicates that: Show Answer

Q223) Maize has 10 pairs i.e. 20 chromosomes. How many linkage group should it possess? Show Answer

Q224) Mental retardation in man associated with sex chromosomal abnormality is usually due to: Show Answer

Q225) Father of human genetics / biochemical genetics is: Show Answer

Q226) The term crossing over was coined by: Show Answer

Q227) In haploids the monohybrid ratio is: Show Answer

Q228) The somatic chromosome complement in all human beings is: Show Answer

Q229) For making important contribution in respect to the nature of genes, the Nobel prize was awarded to: Show Answer

Q230) Who induced mutations by X-ray irradiation in fruit fly for the first time? Show Answer

Q231) An exchange of segments between the two non-homologous chromosomes is called: Show Answer

Q232) If a part of the chromosome gets detached and lost during the cell division, the mutation so produced is called: Show Answer

Q233) Aneuploidy is the term applied for: Show Answer

Q234) Haemophilia / Bleeder's disease was discovered by: Show Answer

Q235) The genetic information needed for the complete development of an individual is contained in a haploid set of chromosomes. Which type of reproduction gives evidence for above statement? Show Answer

Q236) Telocentric chromosome differs from submetacentric chromosome in that: Show Answer

Q237) A man homozygous for brown colour marries a lady heterozygous for brown colour. If the gene for brown colour is dominant, what will be the fate of their children: Show Answer

Q238) Human gene determining sex at seventh week of pregnancy called TDF is present on: Show Answer

Q239) Which of the following disease is related to haemopilia? Show Answer

Q240) A woman with two genes, one for haemophilia and a gene for colour blindness on one of the 'X' chromosomes marries a normal man. Progeny will be: Show Answer

Q241) In Down's Syndrome, karyotyping has shown that the disorder is associated with trisomy of chromosome number 21 usually due to: Show Answer

Q242) The reason why vegetatively reproducing crop plants are best suited for maintaining hybrid vigour is that: Show Answer

Q243) Albinism is known to be due to an atuosomal recessive mutation. The first child of a couple with normal skin pigmentation was an albino. What is the probaility that their second child will also be an albino? Show Answer

Q244) The hereditary material present in the bacterium Escherichia coli is: Show Answer

Q245) After crossing two plants, the progenies are found to be male sterile. This phenomenon is found to be maternally inherited and is due to some genes which reside in: Show Answer

Q246) A fruit fly is heterozygous for sex-linked genes. When mated with a normal female fruit fly, the male-specified chromosome will enter egg cells in the proportion of: Show Answer

Q247) Genetic identity of a human male is determined by: Show Answer

Q248) A mutation at one base of the first codon, of a gene produces a non-functional protein. Such a mutation is called: Show Answer

Q249) Genes are packed into a bacterial chromosome by: Show Answer

Q250) Different muations referrable to the same locus of chromosomes give rise to: Show Answer

Q251) Genes located on mitochondrial DNA: Show Answer

Q252) A person with the sex chromosome XXY suffers from: Show Answer

Q253) Sex chromosomes remain in: Show Answer

Q254) Polyploidy can result from: Show Answer

Q255) The barr body is observed by: Show Answer

Q256) In a linear chromosome, map distance between few loci are as follows: a - b= 10, b - c = 4, a - d = 3, a - c = 6 The cross over frequency between c and d is: Show Answer

Q257) Two dominant, non-allelic genes are exactly 50 map units apart. What is means is that linkage: Show Answer

Q258) Cytoplasmic male sterility is inherited: Show Answer

Q259) Barr body in human female is formed by: Show Answer

Q260) Lampbrush chromosomes occur during: Show Answer

Q261) H. J. Muller was awarded Nobel Prize for his: Show Answer

Q262) In which of the following diseases, man has an extra X-chromosome: Show Answer

Q263) A man with a certain disease marries a normal woman. They have eight children (3 daughters and 5 sons). All the daughters suffer from their father's disease but none of the sons are affected. Which of the following mode of inheritance do you suggest for his disease: Show Answer

Q264) Crossing over takes place during which of the following stage: Show Answer

Q265) Mongoloid syndrome is due to: Show Answer

Q266) The exchange of genetic material between chromatids of paired homologous chromosomes during first meiotic division is called: Show Answer

Q267) Sex factor in bacteria: Show Answer

Q268) A person with 47 chromosomes due to an additional Y chromosome suffers from a condition called: Show Answer

Q269) Sex-linked disease is: Show Answer

Q270) Sometimes chromosome number increase or decrease due to: Show Answer

Q271) In Hybrid break down: Show Answer

Q272) Haemophilic disease of new born baby is caused by: Show Answer

Q273) Recessive characters are expressed when present: Show Answer

Q274) In order to determine whether variations of a character in a population were genetically controlled, the most appropriate producer will be: Show Answer

Q275) The most striking example of point mutation is found in a disease called: Show Answer

Q276) Which is the main category of mutation? Show Answer

Q277) Cross over frequency is proportional to: Show Answer

Q278) Polytene chromosomes were first studied in: Show Answer

Q279) In multifactorial inheritance: Show Answer

Q280) Complete linkage in Drosophila males: Show Answer

Q281) Sickle cell anaemia: (i) follows the same inheritance pattern as that of haemophilia. (ii) follows the same inheritance pattern as that of albinism. (iii) is a sex linked trait. (iv) is due to a single recessive point mutation leading to the substitution of a single amino acid in the b-charn of haemoglobin of the sentences written as: Show Answer

Q282) The human disease which is inherited as a simple recessive trait: Show Answer

Q283) If frequency of allele B in a population is 0.70 then the frequency of allele b would be: Show Answer

Q284) A mother with B blood group has two children, one with A blood group and other with O blood group. Her husband has O blood group. The correct sentence regarding the above data is: Show Answer

Q285) Carrier of a genetic disorder: Show Answer

Q286) Drosophila flies with XXY genotype are females but in case of humans, such individuals are abnormal males (Klinetelter's syndrome). This indicates that: Show Answer

Q287) Mongoloid idiocy in humans is also known as: Show Answer

Q288) One function of the telomeres in a chromosome is to: Show Answer

Q289) During organ differentiation in Drosophila an organ is often modified to another organ such as wings could be replaced by legs. Genes responsible for such metamorphosis are called: Show Answer

Q290) Extranuclear chromosomes occurs in: Show Answer

Q291) Extranuclear inheritance occurs in: Show Answer

Q292) No. of Bar body in XXXX female is: Show Answer

Q293) Male XX and female XY sometimes occur due to: Show Answer

Q294) A and B genes are linked. What shall be genotype of progeny in a cross between. AB/ab and ab/ab? Show Answer

Q295) Probability of four sons to a couple is: Show Answer

Q296) What is true for plasmid? Show Answer

Q297) Genes for cytoplasmic male sterility in plants are generally located in: Show Answer

Q298) The mutation which is not transferred to the offspring: Show Answer

Q299) When an animal has both sexes (male or female), it is called: Show Answer

Q300) Germplasm theory was proposed by: Show Answer

Q301) The example of XY linked gene inheritance is: Show Answer

Q302) A person having 45 chromosomes and Y-chromosome absent, is suffering from Show Answer

Q303) Haemophilia is a: Show Answer

Q304) Which of the following variations are temporary and have nothing to do with the last or next generation? Show Answer

Q305) In Drosophila, the sex is determined by: Show Answer

Q306) Christmas disease is another name for: Show Answer

Q307) Pattern baldness, moustahes and beard in human males are exmples of: Show Answer

Q308) A double stranded DNA having 100, 000 bp will have a length of: Show Answer

Q309) Map distance of genes is calculated by: Show Answer

Q310) Sex determination in Drosophila melanogaster is based on: Show Answer

Q311) When a diploid female plant is crossed with a tetraploid male plant, then ploidy of endosperm cells in the resulting seed is: Show Answer

Q312) In a mutational event, when adenine is replaced by guanine, it is a case of: Show Answer

Q313) After the mutation at a genetic locus, the character of an organism changes due to change in: Show Answer

Q314) Which of the following value is generally constant for a given species? Show Answer

Q315) One of the parents of a cross has a mutation in its mitochondria segregation of F_2 progenies, mutation is found in: Show Answer

Q316) Lack of independent assortment of genes A and B in fruit fly Drosophila is due to: Show Answer

Q317) Total number of base pairs found in human genome is: Show Answer

Q318) Polytene chromosomes in salivary glands of Drosophila are formed as a result of: Show Answer

Q319) When chromosome breaks and the two fragments join together after rotating by 180^@ is called: Show Answer

Q320) Mitochondrial inheritance occurs: Show Answer

Q321) In Limnaea shell coiling is due to: Show Answer

Q322) Transposons are: Show Answer

Q323) A nucleosome is a portion of the chromonema containing: Show Answer

Q324) The diagrammatic representation of the chromosomes of an individual is called: Show Answer

Q325) What are episomes? Show Answer

Q326) The genes are located on chromosomes. It was proposed by: Show Answer

Q327) Histones are present in: Show Answer

Q328) Sudden and heritable change in a character of an organism is called: Show Answer

Q329) Which of the following is incorrectly paired? Show Answer

Q330) When the chromosome number of a given organism has one additional chromosome in one of the following pairs, the condition is known as: Show Answer

Q331) Aneuploidy is: Show Answer

Q332) The major chemical components of chromosomes are DNA, RNA, histones and non-histone proteins. Besides, there is one very important inorganic chemical, which is: Show Answer

Q333) The salivary gland chromosomes in the dipteran larvae, are useful in gene mapping because: Show Answer

Q334) A woman with normal vision, but whose father was colour blind, marries a colour blind man. Suppose that the fourth child of this couple was a boy. This boy: Show Answer

Q335) A woman with 47 chromosomes due to three copies of chromosome 21 is characterized by: Show Answer

Q336) Haemophilia is more commonly seen in human males than in human females because: Show Answer

Q337) A man and a woman, who do not show any apparent signs of a certain inherited disease, have seven children (2 daughters and 5 sons). Three of the sons suffer from the given disease but none of the daughters are affected. Which of the following mode of inheritance do you suggest for this disease? Show Answer

Q338) Genes for cytoplasmic male sterility is generally located in: Show Answer

Q339) G-6-P dehydrogenase deficiency is associated with haemolysis of: Show Answer

Q340) The "Cri-du-chat" syndrome is caused by change in chromosome structure involving Show Answer

Q341) The correct pathway for the synthesis of skin pigment is: Show Answer

Q342) Which one of the following techniques is employed in human genetic counselling? Show Answer

Q343) Edward's, Patau's , Down's syndromes are due to: Show Answer

Q344) Barr body is found in the nucleus during: Show Answer

Q345) Both sickle cell anemia and Huntington's chorea are: Show Answer

Q346) In which mode of inheritance do you expect more material influence among the offspring? Show Answer

Q347) Cri-du-chat syndrome in humans is caused by the: Show Answer

Q348) Genes present in the cytoplasm of eukaryotic cells are found in Show Answer

Q349) What would be the number of chromosomes in the cells the aleurone layer in a plant species with 8 chromosomes in its synergids? Show Answer

Q350) If a colourblind woman marries a normal visioned man, their sons will be: Show Answer

Q351) Which one of the following is the most suitable medium for culture of Drosophila melanogaster: Show Answer

Q352) Assertion (A): Phenylketonuria is a recessive hereditary disease caused by body's failure to oxidise an amino acid phenylalanine to tyrosine because of defective enzyme.
Reason (R): It results the presence of phenylalanine acid in urine. Show Answer

Q353) Gynaecomastia is a symptom of: Show Answer

Q354) The distance between the genes a, b, c and d in mapping units are a - d = 3.5; b - c = 1; a - b = 6; c - d = 1.5; a - c = 5. Find out the sequence of arrangement of these genes Show Answer

Q355) Which one of the following conditions in humans is correctly matched with its chromosomal abnormality / linkage: Show Answer

Q356) Which one of the following conditions correctly describes the manner of determining the sex in the given example? Show Answer

Q357) A person with unknown blood group under ABO system, has suffered much blood loss in an accident and needs immediate blood transfusion. His one friend who has a valid certificate of his own blood type, offers for blood donation without delay. What would have been the type of blood group of the donor friend? Show Answer

Q358) Mutation can be induced with: Show Answer

Q359) What are those structures that appear as "beads on strings" in the chromosomes when viewed under electron microscope? Show Answer

Q360) Sutton and Boveri proposed the chromosome theory of inheritance (1902) which was expanded by T. H. Morgan and others. In 1909 who replaced the term factor with gene as basic unit of inheritance? Show Answer

Q361) In a Morgan's cross of Drosophila involving yellow body (y) and white eyed mutant (w) females and wild type males (grey body and red eyed). What is the % age of yellow bodied and red eyed flies and grey bodied and white eyed types? Show Answer

Q362) The product of recombination is called: Show Answer

Q363) Chiasma type hypothesis is based on: Show Answer

Q364) Earlier the genetic maps of chromosomes were constructed based on recombination frequency. In recent years most detailed as precise genetic maps have been prepared by: Show Answer

Q365) Calvin Bridge while experimenting on Drosophila demonstrated: Show Answer

Q366) Cri-du-chat syndrome is caused due to: Show Answer

Q367) If the centromere is included in inverted segment during inversion, it is called: Show Answer

Q368) The organisms having multiple of monoploid number (X) are called: Show Answer

Q369) Polyploids have important application in: Show Answer

Q370) The length of 46 human chromosomes taken together is about 2 metres. What is the length of large circular chromosome of bacterium E.coli? Show Answer

Q371) Nucleosome of eukaryotic chromosome consists of: Show Answer

Q372) Cystic fibrosis caused due to: Show Answer

Q373) Alzheimer disease involves loss of memory and ability of judgement. It is common among? Show Answer

Q374) In a medico legal case of accidental interchange between two babies in a hospital, the baby of the blood group A could not be rightly given to couple with: Show Answer

Q375) In which one of the following combinations (1-4) of the number of chromosomes is the present day hexaploid wheat correctly represented? Show Answer

Q376) Which of the following is correct: Show Answer

Q377) Parts of DNA which switch their positions are called Show Answer

Q378) DNA replication requires Show Answer

Q379) In 1868 DNA was discovered by the Swedish biochemist Show Answer

Q380) In 1928 Frederick Griffith showed that the hereditary material can pass from one type to bacteria into another through a process called Show Answer

Q381) The transforming substance of Pneumococcus in Griffiths experiment was Show Answer

Q382) What was the finding of Hershey and Chase? Show Answer

Q383) What is the distance between two base pairs in the double helix model of DNA? Show Answer

Q384) Hydrogen bonds occur between which of the following constituents of DNA? Show Answer

Q385) In one strand of DNA the sequence of bases is AAATGGCCCTT, then the complementary sequence of bases on the other side of the strands would be Show Answer

Q386) The difference in A, B and Z forms of DNA lies in Show Answer

Q387) In 1957, Meselson and Stahl concluded from their studies that Show Answer

Q388) In bacterial chromosome Show Answer

Q389) Replication is continuous in Show Answer

Q390) Transcription refers to the Show Answer

Q391) Generally only one strand of DNA is transcribed. This strand is called Show Answer

Q392) Which of the following RNA polymerase catalyses the formation of transfer RNA in eukaryotes? Show Answer

Q393) What is a codon? Show Answer

Q394) The chain initiating codon is Show Answer

Q395) The chain-terminating codon is Show Answer

Q396) A larger cluster of ribosome is called Show Answer

Q397) Nonsense codon is responsible for Show Answer

Q398) Out of 64 codons how many of them code for amino acids? Show Answer

Q399) Which one is not applicable in respect of genetic code? Show Answer

Q400) Which one is correct? Show Answer

Q401) One gene one enzyme hypothesis was proposed by Show Answer

Q402) Which of the following is not associated with preparation of checker-board for genetic code? Show Answer

Q403) Ligase is an enzyme required for Show Answer

Q404) DNA duplication or multiplication is called Show Answer

Q405) Escherichia coli with completely radioactive DNA was allowed to replicate in nonradioactive medium for two generations. Percentage of bacteria with radioactive DNA is Show Answer

Q406) Initiation of polypeptide chain takes place through Show Answer

Q407) Termination of polypeptide chain is brought about by Show Answer

Q408) The process of translation relates to Show Answer

Q409) Information transfer from RNA to DNA is called Show Answer

Q410) Circular DNA is found in Show Answer

Q411) Okazaki fragments are formed during Show Answer

Q412) Nucleotide base present in DNA and not in RNA is Show Answer

Q413) Pyrimidine base present in RNA in place of thymine of DNA is Show Answer

Q414) Which of the following sugars is found in RNA? Show Answer

Q415) RNA that picks up specific amino acid from amino acid pool of cytoplasm to carry it to ribosome during protein synthesis is Show Answer

Q416) DNA duplex shows Show Answer

Q417) Experimental evidence supporting concept of triplet genetic code was first provided by Show Answer

Q418) If in a DNA molecule cytosine is 18%, the percentage of adenine would be Show Answer

Q419) Genetic code translates the language of Show Answer

Q420) Isotopes used in proving semiconservative replication of DNA were Show Answer

Q421) Which is true according to Chargaffs rule? Show Answer

Q422) How many pairs of nucleotides are present in one turn of DNA helix? Show Answer

Q423) Reverse transcription was discovered by Show Answer

Q424) The flow of information from DNA and mRNA and then to proteins is called Show Answer

Q425) Watson and Crick proposed the model of DNA structure in Show Answer

Q426) Nucleic acids are polymers of Show Answer

Q427) Which is required for protein synthesis? Show Answer

Q428) Synthesis of DNA from RNA temple occurs in Show Answer

Q429) The site of tRNA that binds to mRNA is Show Answer

Q430) Triplet codon refers to sequence of three bases on Show Answer

Q431) Enzyme required for transcription is Show Answer

Q432) DNA is present in Show Answer

Q433) The functional unit of gene that specifies synthesis of one polypeptide is Show Answer

Q434) Regulator gene controls chemical synthesis (operon system) by Show Answer

Q435) The term cistron, recon and muton were proposed by Show Answer

Q436) Bacterial nucleoid has Show Answer

Q437) In operon model, RNA polymerase binds to Show Answer

Q438) Which one of the following synthesizes a repressor protein? Show Answer

Q439) Operon model of gene regulation in prokaryotes was proposed by Show Answer

Q440) The smallest gene affected by mutation is Show Answer

Q441) In Escherichia coli, lac operon is induced by Show Answer

Q442) Lac operon is Show Answer

Q443) Wild type Escherichia coli growing on medium having glucose is transferred to lactose containing medium. Which one of the following change will occur? Show Answer

Q444) Viruses possess Show Answer

Q445) In split genes, the coding sequences are called Show Answer

Q446) Go through the following statements.
I. In DNA replication, the primer is small ribonucleotide polymer.
II. DNA acts as a template for synthesis of both DNA and RNA.
III. tRNA attaches amino acid at its 3' end.
IV. Blender experiment to prove DNA as genetic material was performed by Watson ad Crick. Show Answer

Q447) If the sequence of bases in the coding strand of a double stranded DNA is 5' - GTTCGAGAGTC - 3', the sequence of bases in its transcript will be Show Answer

Q448) Operator gene of lac-operon is turned on when lactose molecules bind to Show Answer

Q449) Introns are part of DNA which Show Answer

Q450) In operon model, regulator gene functions as Show Answer

Q451) A gene that takes part in synthesis of polypeptide is Show Answer

Q452) The part of operon producing repressor is called Show Answer

Q453) Tryptophan operon of Escherichia coli is Show Answer

Q454) DNA fingerprinting involves identifying differences in some specific regions in DNA sequence called as Show Answer

Q455) The technique of DNA fingerprinting was initially developed by Show Answer

Q456) Human Genome Project (HGP) was closely associated with the rapid development of a new area in biology called as Show Answer

Q457) Who has established the fact that DNA is a helix of uniform diameter? Show Answer

Q458) The process of transcription is terminated by Show Answer

Q459) For transcription RNA polymerase attaches to the Show Answer

Q460) Which of the following is true, if in a DNA adenine is represented by a, guanine by b, cytosine by c and thymine by d? Show Answer

Q461) In a DNA molecule adenine will be equal to Show Answer

Q462) Imagine an error occurring during DNA replication in a cell, so that where there is supposed to be a T in one of the genes there is instead a G. What effect will this probably have on the cell? Show Answer

Q463) A particular __________ carries the information for making a particular polypeptide, but _________ can be used to make any polypeptide. Show Answer

Q464) A sequence of pictures of polypeptide synthesis shows a ribosome holding two transfer RNAs. One tRNA has a polypeptide chain attached to it; the other tRNA has a single amino acid attached to it. What does the next picture show? Show Answer

Q465) At one point as a cell carried out its day-to-day activities, the nucleotides GAT were paired with the nucleotides CUA. This pairing occurred Show Answer

Q466) Human Genome Project was officially started in Show Answer

Q467) Which of the following is true?
A. 'Operon hypothesis' was proposed by Jacob and Monod.
B. 'One gene-one enzyme theory' was proposed by Beadle and Tatum.
C. 'Southern blotting' is used in DNA fingerprinting.
D. Uracil bases remain present in DNA. Show Answer

Q468) Adenosine is Show Answer

Q469) Intron is -
A. Coding sequence.
B. Non-coding sequence.
C. Character of Prokaryotic genome.
D. Character of eukaryotic genome. Show Answer

Q470) A transcription unit in DNA consists of -
A. A promoter.
B. The structural gene.
C. A terminator.
D. None. Show Answer

Q471) In chromosome, DNA is associated with -
A. Negatively charged proteins.
B. Positively charged proteins.
C. Neutral proteins.
D. NHC protein. Show Answer

Q472) Heterochromatin -
A. Is more densely packed.
B. It stains dark.
C. Is transcriptionally active.
D. Is transcriptionally inactive. Show Answer

Q473) DNA -
A. acts as genetic material in all cellular organisms.
B. Was discovered by F. Meischer who named it as 'Nuclein'.
C. Is acidic in nature.
D. Cannot be digested by DNase. Show Answer

Q474) In 1953 J. Watson and F. Crick proposed Double helix model of DNA and got Nobel Prize. Their model of DNA was based on -
A. X-ray diffraction of DNA produced by M. Wilkins and R. Franklin.
B. Griffith's experiment.
C. Hershey - Chase experiment.
D. Chargaff's rule of base equivalence (A + G / T + C = 1). Show Answer

Q475) Euchromatin is -
A. Loosely packed.
B. Stains light.
C. Transcriptionally active.
D. Early replicating. Show Answer

Q476) The phosphodiester bonds between nucleotides are called Show Answer

Q477) In one polynucleotide chain of a DNA molecule the ratio of A + T / G + C is 0.3. What is the A + G / T + C ratio of the entire DNA molecule Show Answer

Q478) Which one / ones did not affect the transformation?
A. DNAase
B. RNAase
C. Peptidase
D. Lipase Show Answer

Q479) It is nonsense of think that DNA has Show Answer

Q480) In DNA you find which type(s) of bond.
A. Phosphodiester
B. Phosphoester
C. Hydrogen
D. Glycosidic bond Show Answer

Q481) The structures in chromatin seen as 'beads-on string' when viewed under electron microscope are called Show Answer

Q482) A nucleosome consists of -
A. RNA
B. Protein
C. Histone octamer
D. 200 bps long DNA Show Answer

Q483) A. Both DNA and RNA are able to mutate.
B. RNA being unstable, mutates at a faster rate.
C. RNA is also known to be catalytic, hence reactive.
D. The presence of thymine at place of uracil confers additional stability to DNA. Show Answer

Q484) Protein synthesis involves -
A. Transcription
B. Translation
C. Transversion
D. Translocation Show Answer

Q485) The structure of DNA is characterized by Show Answer

Q486) Antiparallel relationship of the two strands of DNA refers to the Show Answer

Q487) Which one/ones is/are false for DNA replication? Show Answer

Q488) DNA polymerase -
A. Is the main enzyme for RNA synthesis.
B. Is DNA dependent DNA polymerising enzyme.
C. Is highly efficient enzyme.
D. It catalyses reaction with high degree of accuracy. Show Answer

Q489) A sequence of three RNA base can function as -
A. Codon.
B. Gene.
C. Adticodon.
D. Nucleosides. Show Answer

Q490) The difference(s) between mRNA and tRNA is/are that -
A. mRNA has more elaborated 3-dimensional structure due to extensive base-pairing.
B. tRNA has more elaborated 3-dimensional structure due to extensive pairing.
C. tRNA is usually smaller than mRNA.
D. mRNA bears anticodon but tRNA has codons. Show Answer

Q491) Genetic code consists of -
A. Adenine and guanine.
B. Riboflavin and ATP.
C. Cytosine and Guanine.
D. Cytosine and Uracil. Show Answer

Q492) Nucleic acids are made up of
A. Nitrogenous bases.
B. Amino acids.
C. Sugar.
D. Phosphate. Show Answer

Q493) DNA replication needs Show Answer

Q494) Transcription needs -
A. DNA template.
B. NTPs.
C. RNA polymerase.
D. Sigma and Rho factors. Show Answer

Q495) The function of the promoter is to signal RNA polymerase as to -
A. Where to stop transcibing the DNA.
B. Where to start transcribing the DNA.
C. Which strand of the DNA to be read.
D. None. Show Answer

Q496) In eukaryotes the gene expression is regulated at -
A. Transcriptional level.
B. Processing level.
C. Transport of mRNA from nucleus to the cytoplasm.
D. Translation level. Show Answer

Q497) A translational unit in mRNA includes -
A. Start codon.
B. Stop codon.
C. Untranslated regions (UTR).
D. Coding sequence is located between the start codon and termination codon. Show Answer

Q498) A. In eukaryotes there are at-least three RNA polymerase.
B. HnRNA has both exons and introns.
C. HnRNA is formed in both prokaryotes and eukaryotes.
D. Any mistake in DNA replication may cause mutation. Show Answer

Q499) In prokaryotes, gene regulation occurs at the level of Show Answer

Q500) In human -
A. Non-coding DNA is the most abundant.
B. The function of more than 50% discovered genes are unknown.
C. Less than 2% of genome codes for protein.
D. Total number of genes is 30,000. Show Answer

Q501) Which of the following statements is/are incorrect about tRNA?
A. It binds to DNA, initiating translation.
B. It has a greater molecular weight than mRNA.
C. It transfers the code from the nucleus to cytoplasm.
D. There is at-least one form for each kind of amino-acid. Show Answer

Q502) Transcription is most similar to Show Answer

Q503) Satellite DNA -
A. Is classified in many catagories such as micro-statellites, minisatellites, etc. on the basis of base composition length of segments and number of repetitive units.
B. Normally does not code for any protein.
C. Shows polymorphism.
D. Forms the basis of DNA fingerprinting. Show Answer

Q504) A. DNA polymorphism plays important role in evolution and speciation.
B. 99.9% nucleotides bases are exactly same in all people.
C. Chromosome 1 has the fewest genes (23) and Y-chromosome has most genes (2968).
D. BAC and YAC have been used in Human Genome Project. Show Answer

Q505) Which one(s) is/are correct?
A. In prokaryotes singles type of RNA polymerase can transcribe mRNA, tRNA and rRNA.
B. In eukaryotes RNA polymerase I transcribes rRNA (28s, 18s and 5.8s) whereas RNA pol. III is responsible for transcription of tRNA, 5s rRNA and RNAs.
C. RNA pol. II trancribes HnRNA in eukaryotes.
D. Ribosomal large subunit has P and A-sites. Show Answer

Q506) The human genome consists of over ___________ base pairs. Show Answer

Q507) The current estimate of the number of genes in the human - Show Answer

Q508) Which of the following is required in protein synthesis?
A. Ligase.
B. tRNA.
C. mRNA.
D. Endonuclease. Show Answer

Q509) Polymorphism in DNA sequence -
A. Is the basis of genetic mapping of human genome.
B. Arises due to mutation.
C. Is the basis of DNA finger printing.
D. None. Show Answer

Q510) Which of the following statements is correct about Human Genome Project Show Answer

Q511) DNA has a alternate grooves Show Answer

Q512) Similarity between DNA and RNA is that both have -
A. adenine.
B. Guanine.
C. Thymine.
D. Cytosine. Show Answer

Q513) Genetic code is -
A. triplet.
B. Degenerate.
C. Nonambiguous.
D. Universal. Show Answer

Q514) DNA replication involves -
A. Unwinding of helix.
B. Transcription.
C. Formation of primer strand.
D. Translation. Show Answer

Q515) Which one is correct?
A. DNA cannot produce its copies without DNA polymerase.
B. DNA cannot produce RNA.
C. RNA can produce complementary DNA/cDNA.
D. DNA helps in protein synthesis. Show Answer

Q516) Nucleosome contains -
A. RNA.
B. DNA.
C. Histones.
D. All of these. Show Answer

Q517) AUG initiation codon occurs over Show Answer

Q518) Split genes include -
A. Pseudoalleles.
B. Transposons.
C. Exons.
D. Introns. Show Answer

Q519) The experimental proof for DNA as genetic material comes from -
A. Transformation.
B. Transduction.
C. Conjugation.
D. Mutation. Show Answer

Q520) Which of the following statements about the work of Griffith, and then Avery, MacLeod and Mc Carty on Streptococcus pneumoniae is false? Show Answer

Q521) Which of the following was not important evidence that helped advance the idea that DNA is the genetic material? Show Answer

Q522) Which of the following statements about the Hershey-Chase experiment is false? Show Answer

Q523) You estimate that cytosine represents 30% of the total pyrimidine content of DNA from a mouse cell. Using Chargaff's rules, you determine that the percentage of total nucleotides in the DNA represented by adenine is Show Answer

Q524) Which of the following statements about the structure of DNA is false? Show Answer

Q525) The unequivocal proof that DNA is the genetic material came from the experiment which utilized Show Answer

Q526) How many adenylate residues are added at 3' end during the processing of hnRNA in eukaryotes? Show Answer

Q527) Which of the following model organisms has been sequenced? Show Answer

Q528) nu body of nucleosome consists of Show Answer

Q529) Super solenoid model of nucleosome has Show Answer

Q530) Which one of the following is used as marker chromosome? Show Answer

Q531) The Human Genome Project as mega-project was a 13 year project coordinated by the Show Answer

Q532) Sequencing of model organism like Caenorhabditis elegans (a free living non-pathogenic nematode) was achieved in April, 2003 with Show Answer

Q533) Percentage of protein encoding genes and transposable elements in Human genome are respectively Show Answer

Q534) SNP which is pronounced as 'snips' stands for Show Answer

Q535) HGP methodology which includes identification of all the genes that express as RNA is referred as Show Answer

Q536) According to Human Genome Project, the percentage of introns in human genome is approximately Show Answer

Q537) The last human chromosome which sequence was completed in May 2006 is Show Answer

Q538) Sequencing the whole set of genome that contains all the coding and non coding parts is Show Answer

Q539) Father of DNA finger printing is Show Answer

Q540) Find the incorrect match Show Answer

Q541) Separation of DNA fragments into bands by electrophoresis is done on Show Answer

Q542) Blotting technique involves transfer of DNA from Show Answer

Q543) Enzyme utilized for the synthesis of RNA copolymers and homopolymers during deciphering of genetic code is Show Answer

Q544) Choose the correct statement w.r.t. satellite DNA Show Answer

Q545) The entire genetic code consist of _______ amino acids and ___________ codons. Show Answer

Q546) The length of E. coli DNA and length of DNA in a human 2N cell is Show Answer

Q547) The length of human DNA in a diploid cell is Show Answer

Q548) Which of the following is the best order of sequential, increasing condensation (packing) of DNA Show Answer

Q549) When chromatin is treated with nonspecific nucleases, what is the length of the resulting pieces of DNA? Show Answer

Q550) In mammalian cells, the DNA of the centromere is characteristics of Show Answer

Q551) What do telomeres do? Show Answer

Q552) If gene code is tetraplet then what is the possible number of codons which code 20 types of amino acids Show Answer

Q553) Of the _________ different possible codons, ________ specify amino acids and ______ signal stop. Show Answer

Q554) Which of the following statements is true regarding introns? Show Answer

Q555) Which mode of information transfer usually does not occur? Show Answer

Q556) A geneticist isolate a gene for a specific trait under study. She also isolates the corresponding mRNA. Upon comparison, the mRNA is found to contain 1,000 fewer bases than the DNA sequence. Did the geneticist isolate the wrong DNA? Show Answer

Q557) The effort to decipher the genetic code was led by _________ who was awarded Nobel Prize for is work Show Answer

Q558) Transcription and translation of a gene composed of 30 nucleotides would form a protein containing no more than ________ amino acids. Show Answer

Q559) During translation, the __________ site within the ribosome holds the growing amino acids chain while the ___________ site holds the next amino acid to be added to the chain. Show Answer

Q560) Relative amounts (mole %) of nitrogen bases in a genomic DNA sample are as follows -
A : 24.7;
G : 24.1;
T : 32.7;
C : 18.5.
The most likely source of DNA is Show Answer

Q561) An mRNA ready for translation would have Show Answer

Q562) Dr. Venkataram Ramakrishnan is one of the three recipients of the 2009 Nobel Prize for Chemistry. He worked towards the elucidation of the three-dimensional structure of ribosomes. Ribosomes are involved in the biosynthesis of proteins and Show Answer

Q563) Which one of the following also acts as a catalyst in a bacterial cell? Show Answer

Q564) What are those structures that appear as 'beads-on-string' in the chromosomes when viewed under electron microscope? Show Answer

Q565) During chromosome replication, the following events occur -
(i) Breaking of H bonds between bases.
(ii) Bonds between adjacent nucleotide form.
(iii) Winding brings about formation of two double helices.
(iv) Bases on free nucleotides bond with bases on DNA strands.
Which of the following shows the correct sequence? Show Answer

Q566) The histone protein that attaches to DNA strands between nucleosomes is _________. Show Answer

Q567) Chromosomes must condense to approximately 1/500the of their length for cell division. The first reduction is _______. Show Answer

Q568) If a small chromosome consists of 500,000,000 nucleotides, how any nucleosomes will attach to that chromosome? Show Answer

Q569) The unequivocal proof of DNA as the genetic material came from the studies on a Show Answer

Q570) In m-RNA base sequence is 5' AAC CAA GAC CCC 3' what is the possible no. of codons in case of overlapping and non overlapping respectively Show Answer

Q571) Which of the following is not the characteristic feature of genetic code Show Answer

Q572) More than one initiation codon and termination codons are found in which RNA Show Answer

Q573) Which one of the following is a wrong statement regarding mutations? Show Answer

Q574) Read the following four statements (A-D):
(A) In transcription, adenosine pairs with uracil.
(B) Regulation of lac operon by repressor is referred to as positive regulation.
(C) The human genome has approximately 50,000 genes.
(D) Haemophilia is a sex-linked recessive disease.
How many of the above statements are right? Show Answer

Q575) What is it that forms the basis of DNA Fingerprinting? Show Answer

Q576) Crick, one of the discoverer of DNA double helical structure, was the man of Show Answer

Q577) The number of codons that code different amino acids is Show Answer

Q578) Some amino acids are coded by more than one codon hence the code is Show Answer

Q579) Out of 64 codons, the number of codons with GGG is Show Answer

Q580) Which one of the following is not a part of a transcription unit in DNA? Show Answer

Q581) Ribosomal RNA is actively synthesized in Show Answer

Q582) If one strand of DNA has the nitrogenous base sequence at ATCTG, what would be the complementary RNA strand sequence Show Answer

Q583) Removal of introns and joining of exons in a defined order during transcription is called Show Answer

Q584) Removal of RNA polymerase III from nucleoplasm will affect the synthesis of Show Answer

Q585) Which enzyme/s will be produced in a cell in which there is a nonsense mutation in the lac Y gene? Show Answer

Q586) Which one of the following is not an application of DNA finger printing? Show Answer

Q587) Cyanogen bromide is used in __________. Show Answer

Q588) If the DNA codons are ATG ATG ATG and a cytosine base in inserted at the beginning, which of the following will result? Show Answer

Q589) The blind approach of sequencing the whole set of genome is referred as Show Answer

Q590) The commonly used 'DNA finger printing technique' in forensic science is simply a method called Show Answer

Q591) DNA finger printing is based on Show Answer

Q592) In DNA fingerprinting Show Answer

Q593) DNA fingerprinting is done by a technique called Show Answer

Q594) Restriction fragment length polymorphism (RFLP) is Show Answer

Q595) In order to identify the person who committed a crime. Forensic experts will need to extract DNA from the tissue sample collected at the crime scene, and conduct one of the following procedures for DNA finger-printing analysis Show Answer

Q596) PCR and Restriction Fragment Length Polymorphism are the methods for Show Answer

Q597) Which of the DNA sources would be suitable for DNA finger printing -
A - hair,
B - semen,
C - saliva,
D - RBC Show Answer

Q598) Which one of the following is wrongly matched? Show Answer

Q599) Transformation was discovered by Show Answer

Q600) Select the correct option Show Answer

Q601) Commonly used vectors for human genome sequencing are Show Answer

Q602) Which codon is not an indicator of completion of protein synthesis? Show Answer

Q603) Which of the following events would occur in lac operon of E. coli when the growth medium has high concentration of lactose? Show Answer

Q604) A stretch of DNA consisting of 10-20 bases is most appropriately called as Show Answer

Q605) hnRNA is converted to mRNA by Show Answer

Q606) Which of the following is correctly matched? Show Answer

Q607) Of the total number of genes estimated in human genome, nearly 10% are contained in Show Answer

Q608) A transcription unit in DNA is defined primarily by the -
(i) promoter
(ii) structural genes
(iii) okazaki fragments
(iv) adenylate residues
(v) terminator Show Answer

Q609) Read the following statements and choose the correct option -
(i) RNA polymerase associates transiently with 'Rho' factor to initiate transcription.
(ii) In bacteria, transcription and translation takes place in the same compartment.
(iii) RNA polymerase I is responsible for transcription of tRNA.
(iv) When hnRNA undergoes capping process, adenylate residues are added at 3' end in a template independent manner.
(v) hnRNA is the precursor of mRNA. Show Answer

Q610) Choose the correct statement Show Answer

Q611) Aminoacylation of tRNA is essential for Show Answer

Q612) In eukaryotic genes, coding sequences are called Show Answer

Q613) Which site of the tRNA pairs through hydrogen bonding with the triplet codon on mRNA? Show Answer

Q614) Which of the following is the main polymerising enzyme of DNA replication in bacteria? Show Answer

Q615) During termination of translation Show Answer

Q616) The nuclear structure observed by Henking in 50% of the insect sperm after spermatogenesis was Show Answer

Q617) What is nucleosome? Show Answer

Q618) Choose the correct statement among the following Show Answer

Q619) Which was the first catalytic molecule during evolution of life? Show Answer

Q620) The deflection of pitch angle between two successive steps (rungs) of DNA is Show Answer

Q621) RNA polymerase-I transcribes eukaryotic ribosome which does not consist of Show Answer

Q622) In a 3.2 kbp long piece of DNA, 820 adenine bases were found. What would be the number of cytosine bases? Show Answer

Q623) In 125 amino acid sequence if the codon for 25th amino acid is mutated to UAA, then Show Answer

Q624) Which of the following information is essential to determine the genetic map distance between two genes located on the same chromosome? Show Answer

Q625) Lactose (Lac) Operon is regulated by Show Answer

Q626) The enzyme peptidyl transferase of prokaryotes resides in Show Answer

Q627) Select correct combination of statements for DNA fingerprinting.
(i) It is ELISA based technique.
(ii) It is PCR based technique.
(iii) It is used by forensic scientists.
(iv) It is based on the fingerprint of the individual.
(v) It is a test for paternity. Show Answer

Q628) What makes the exact copying of DNA molecules possible? Show Answer

Q629) Which molecule has its synthesis directly controlled by DNA? Show Answer

Q630) In sea urchin DNA, which is double stranded, 17% of the bases were shown to be cytosine. The percentages of the other three bases expected to be present in this DNA are Show Answer

Q631) Gene regulation governing lactose operon of E. coli that involves the lac I gene product is Show Answer

Q632) Satellite DNA is important because it Show Answer

Q633) Identify the correct order of organisation of genetic material from largest to smallest Show Answer

Q634) Which one of the following is not applicable to RNA? Show Answer

Q635) Balbiani rings are sites of Show Answer

Q636) The repressor of the operon is synthesized Show Answer

Q637) If the length of DNA is 1.36 mm, the number of base pairs and nucleosomes in it will be? Show Answer

Q638) If an E. coli with heavy DNA is allowed to grow for 80 minutes in a culture medium of N14H4CI, then what would be the proportion of heavy, light and hybrid densities DNA molecule respectively? Show Answer

Q639) A molecule acts as genetic material must fulfill how many of the following criteria? Show Answer

Q640) Which of the following figures correctly represents the replication? Show Answer

Q641) If a codon consists of 3 bases and there are 5 different kinds of bases in a nucleic acid altogether. How many codon will be there? Show Answer

Q642) If a DNA has 5000 base pair, and amount of adenine is 15% then find out the number of nucleotides of guanine. Show Answer

Q643) We cannot predict the correct sequence of m-RNA from sequence of amino acid. It is due to which property of genetic code. Show Answer

Q644) If more than one variant occurs at a locus in human population with a frequency greater than 0.01. It will usually form. Show Answer

Q645) In Lac operon which of the following regulates the switching on and off of the operon? Show Answer

Q646) Which of the following is ood in reference of genetic code? Show Answer

Q647) Which of the following are correct sequence of techniques used during DNA finger printing?
I. Gel electrophoresis
II. Southern blotting
III. Cell fractionation
IV. Autoradiography Show Answer

Q648) If 4 types of nitrogenous base are present in nucleic acid, genetic code pentaplets. What is the possible number of base substitutions in total codon? Show Answer

Q649) A recent report in the journal nature indicated that there are only 25,000 gene in humans. However, it is likely that there are more than 25,000 different proteins made in humans. A possible explanation for this is Show Answer

Q650) What is the size of microsatellite DNAs used as VNTRs? Show Answer

Q651) Among the organisms given below choose the organism whose genes have not been sequenced. Show Answer

Q652) Which information promises to revolutionise the process of finding chromosomal locations for diseases associated sequence and tracing human history? Show Answer

Q653) Two identical twins will not have same Show Answer

Q654) Which of the following is required as inducer(s) for the expression of Lac operon? Show Answer

Q655) Which of the following is not required for any of the techniques of DNA fingerprinting available at present? Show Answer

Q656) Which one of the following is the starter codon? Show Answer

Q657) Taylor conducted the experiment to prove semiconservative mode of chromosome replication on Show Answer

Q658) The equivalent of a structural gene is Show Answer

Q659) Which of the following rRNAs acts as structural RNA as well as ribozyme in bacteria? Show Answer

Q660) DNA-dependent RNA polymerase catalyzes transcription on one stand of the DNA which is called the Show Answer

Q661) Nucleosome core is intimately associated with Show Answer

Q662) The enzyme, which helps to cut one strand of DNA duplex to release tension of coiling of two strands is Show Answer

Q663) Which of the following amino acid is coded by a single codon? Show Answer

Q664) Initiation of DNA strand synthesis is performed by Show Answer

Q665) The following is not a character of RNA Show Answer

Q666) The branch of science that uses computer methods in the studies of genomes is called as Show Answer

Q667) Who proved experimentally that DNA is genetic material? Show Answer

Q668) The fact that the genetic code is almost universal in living organisms is considered to be evidence that all organisms Show Answer

Q669) A cell is grown in a solution containing radioactive nucleotides, so that its DNA is labelled with radioactivity. It is removed from the radioactive solution and grown in a normal medium, so that any new DNA strands it makes will not be radioactive. In the normal medium, the cell replicates its DNA and divides. The two daughter cells also replicate their DNA and divide, producing a total of four cells. If a dotted line represents a radioactive DNA strand and a solid line represents a nonradioactive DNA strand, which of the following depicts the DNA of the four cells? Show Answer

Q670) An mRNA template is Show Answer

Q671) A free transfer RNA molecule can combine with Show Answer

Q672) If each amino acid weighs 100 mass units, what is the weight (in mass units) of the protein, molecule synthesised from a mRNA molecule which is 600 bases long? Show Answer

Q673) A shorthand method of representing part of a single strand of DNA is shown opposite.
Which of the following shows the correct positions of the phosphate (P), sugar (S) and base (B) molecules? Show Answer

Q674) Listed below are the stages in the cellular synthesis of a protein.
1. Movement of mRNA from nucleus to cytoplasm.
2. Linking of adjacent amino acid molecules.
3. Transcription of mRNA from a DNA template.
4. Fromation of the polypeptide chain.
5. Attachment of the mRNA strand to a ribosome.
In which order do these stages take place? Show Answer

Q675) The following events occur in the replication of DNA.
1. Bonds between complementary bases break.
2. Bonds between complementary bases form.
3. DNA molecule uncoils.
4. Opposite strands separate.
5. Sugar-phosphate bonds form.
6. Free nucleotides align with complementary nucleotides on each strand.
In which order do these events take place? Show Answer

Q676) An mRNA codon for the amino acid alanine is GCC.
How many alanine molecules are present in the polypeptide, containing eight amino acids, coded for by the following DN template?
T C G G C C T A C C G G G C C C A T G C C A A T Show Answer

Q677) Find the number of phosphodiester bonds and glycosidic linkages associated with E. coli DNA respectively Show Answer

Q678) Three types of RNA involved in comparising the structural and functional role for protein synthesis, serving as a template for translation, and transporting amino acid, respectively are Show Answer

Q679) Frederick Griffith conducted experiments testing the virulence of two strains of Streptococcus (R - strain and S-strain). His experiment has 4 specific 'treatments' to it.
Treatment 1, he injected mice with the R-strain and the mice lived.
Treatment 2, he injected mice with the S-strain and the mice died.
Treatment 3, he injected mice with heat-killed S-strain and the mice lived.
Treatment 4, he injected mice with heat-killed S-strain and the mice died.
Which treatment in his experiment is considered a control treatment? Show Answer

Q680) Frederick Griffith conducted experiments testing the virulence of two strains of Streptococcus (R - strain and S-strain). His experiment has 4 specific 'treatments' to it.
Treatment 1, he injected mice with the R-strain and the mice lived.
Treatment 2, he injected mice with the S-strain and the mice died.
Treatment 3, he injected mice with heat-killed S-strain and the mice lived.
Treatment 4, he injected mice with heat-killed S-strain mixed with R-strain and the mice died.
Which treatment in his experiment is considered the experimental treatment? Show Answer

Q681) Why are mice killed by smooth (S) strains of Streptococcus, but not rough (R) strains? Show Answer

Q682) If a researcher added a polymer of synthetic DNA that contained only adenine (A) residues to a reaction containing RNA polymerase and ribonucleotide monomers. What base would be found in the RNA polymer produced? Show Answer

Q683) Which of the following statements is correct?
I. The biochemical nature of genetic material was not defined from the experiments conducted by Griffith.
II. Working on transformation Avery et al concluded DNA is genetic material but not all biologists were convinced.
III. RNA is the genetic material in TMV, QB bacteriophage etc.
IV. DNA is the predominant genetic material while RNA performs dynamic functions of messenger and adapter.
V. Viruses having DNA genome and having shorter life span and evolve faster. Show Answer

Q684) The prediction of sequence of amino acid is ____A____ if the sequence of nucleotides of mRNA is known. The prediction of sequence of nucleotide is concerned mRNA is ____B____ because the genetic code is ____C____. Show Answer

Q685) A very low level of expression of lac operon has to be present in the cell all the time, otherwise Show Answer

Q686) Which one is false? Show Answer

Q687) The Okazaki fragments in DNA chain growth Show Answer

Q688) The length of DNA molecule greatly exceeds the dimensions of the nucleus in the eukaryotic cells. How is this DNA accomodated? Show Answer

Q689) A codon consists of three bases and there are four kinds of bases in a nucleic acid altogether. How many codons will be there? Show Answer

Q690) The year 2003 was celebrated as the 50th anniversary of discovery of Show Answer

Q691) The sequence of structural gene in lac operon is Show Answer

Q692) The length of DNA has 45000 base pairs. How many complete turns will the DNA molecule take? Show Answer

Q693) Go through the following facts -
I. 'AAG' always codes for lysine. It cannot code for any other amino acid.
II. Serine amino acid can be coded by UCU/UCC/UCA or UCG.
III. UUU forms phenyl alanine in bacteria as well as human beings.
IV. UUU GGG CCC AAAAAC codes for five amino acids.
Now point out nature of genetic code after reading above. Show Answer

Q694) A DNA sequence is polymorphic if Show Answer

Q695) An RFLP is a Show Answer

Q696) Tailoring of hnRNA is done by Show Answer

Q697) Which of the following are used in DNA profiling? Show Answer

Q698) DNA profiling has been used to Show Answer

Q699) Which of the following has the longest DNA sequences? Show Answer

Q700) Following paragraph refers to a transcription unit. Fill up the blanks - The ____A____ is located towards 5' end ____B____ of the structural gene (the reference is made with respect to the polarity of coding strand). Both the strands of DNA are involved in forming the _____C_____. The ____D____ is located towards 3' end (_____E_____) of the coding strand. Show Answer

Q701) Which one is correct? Show Answer

Q702) The full form of ELSI is Show Answer

Q703) DNA fingerprinting works because Show Answer

Q704) Which of the following criteria must be fulfilled by a genetic material Show Answer

Q705) Given below are two statements (A and B) each with two blanks.
Select the option which correctly fill up the blanks in two statements - Statements :
A. Use of radioactive thymidine to detect distribution of newly synthesised DNA in the chromosomes was performed on Vicia faba (faba beans) by ____1____ and colleagues in 1958. The experiment proved that the DNA in chromosomes also replicates ____2____.
B. The chemical method developed by Har Gobind Khorana was instrumental synthesising RNA molecules with defined combinations of bases (homopolymers and copolymers). ___1___ cell-free system for protein synthesis finally helped the code to be deciphered. Severo Ochoa enzyme (polynucleotide phosphorylase) was also helpful in polymerising RNA with defined sequence in a ____2____ independent manner (enzymatic synthesis of RNA). Show Answer

Q706) The nitrogenous bases (and the two strands of the DNA double helix) are held together by Show Answer

Q707) The base-paired structure of DNA implies that it Show Answer

Q708) Why must RNA be incorporated into the DNA molecule initially during DNA replication Show Answer

Q709) What ate the three major properties of genes that are explained by the structure of DNA? Show Answer

Q710) Semi-conservatie replication of DNA involves Show Answer

Q711) The molecules that function to replicate DNA in the cell are Show Answer

Q712) The correct order of events for synthesis of the lagging strand is Show Answer

Q713) During replication, the new DNA strand is synthesized Show Answer

Q714) Why were fragments like those now called Okazaki fragments expected before they were discovered? Show Answer

Q715) DNA replication in eukaryotes differs from replication in bacteria because Show Answer

Q716) Which statement is incorrect for asymmetric karyotype? Show Answer

Q717) In eukaryotes, Okazaki fragments are about __________ long. Show Answer

Q718) Which of the following molecules functions to transfer information from one generation to the next? Show Answer

Q719) Mutations are Show Answer

Q720) In order to show that DNA is the "transforming principle", Avery, Macleod and McCarty showed that DNA could transform avirulent strains of Pneumococcus. This hypothesis was strengthened by their demonstration that Show Answer

Q721) During infection of E. coli cells by bacteriophase T2, Show Answer

Q722) Bacteriophage nucleic acids were labelled by carrying out an infection of E. coli cells growing in Show Answer

Q723) Information used by Watson and Crick to determine the structure of DNA included Show Answer

Q724) Double-stranded DNA looks a little like a ladder that has been twisted into a helix or spiral. The side supports of the ladder are Show Answer

Q725) The steps of the ladder are Show Answer

Q726) If a double-stranded DNA molecule contains 30% T, how much G does it contain? Show Answer

Q727) You have analyzed the DNA isolated from a newly discovered virus and found that its base composition is 32% A, 17% C, 32% G, and 19% T. What would be a reasonable explanation of this observation? Show Answer

Q728) The number of glycosidic bonds associated with DNA of diploid human cell are Show Answer

Q729) During DNA replication Show Answer

Q730) The enzyme DNA ligase is required continuously during DNA replication because Show Answer

Q731) In DNA replication each newly made strand is Show Answer

Q732) Which feature of the Watson-Crick model of DNA structure explains its ability to function in replication and gene expression? Show Answer

Q733) The Hershey-Chase experiment convinced most scientists that Show Answer

Q734) Which of the following features summarizes the molecular architecture of DNA? Show Answer

Q735) The fidelity of DNA replication is outstanding. During DNA synthesis, the error rate is of the order of one wrong nucleotide per Show Answer

Q736) Chargaff's rule states that Show Answer

Q737) The first scientist(s) to suggest a mode of replication for DNA was (were) Show Answer

Q738) In eukaryotic cells, each chromosome has Show Answer

Q739) When adding the next monomer to a growing DNA strand, the monomer is added to the Show Answer

Q740) The energy necessary for making a DNA molecule comes directly from the Show Answer

Q741) A deoxyribose nucleotide is a Show Answer

Q742) Synthesis of DNA is Show Answer

Q743) The enzyme that removes the RNA primers is called Show Answer

Q744) The enzyme that restores the phosphodiester linkage between adjacent fragments in the lagging strand during DNA replication is Show Answer

Q745) The building blocks for a new DNA molecule are Show Answer

Q746) The force that holds DNA together in a double helix is Show Answer

Q747) The enzyme that unwinds the DNA prior to replication is called Show Answer

Q748) The first repair of mistakes made during DNA replication is made by Show Answer

Q749) The error rate of changing an incorrect base with another incorrect base during proofreading is Show Answer

Q750) The difference between DNA and RNA is that Show Answer

Q751) If Hershey and Chase has found "S" in both the pellet and the supernatnat, the conclusion about the nature of DNA replication would be that Show Answer

Q752) An alien DNA-like molecule is isolated from the frozen remains of a martian life form that was found beneath the martian polar ice caps. It is found that for every base designated Q, there is 2 times the amount of the base R, and for every base Z there is 2 times the amount of the base designated S. If the molecule contains 12% R, how much Z would you expect? Show Answer

Q753) Complete genome of which non-crop and crop plants has been sequenced? Show Answer

Q754) Number of base pairs in DNA helix around the octamer histone molecule is Show Answer

Q755) Pyrophosphate is a Show Answer

Q756) Which one of the following is not found in DNA? Show Answer

Q757) Boiling DNA causes it to become Show Answer

Q758) What was most remarkable about the Griffith's experiment? Show Answer

Q759) The Hershey-Chase experiment Show Answer

Q760) Griffith could distinguish the two strains of pneumococcus due to Show Answer

Q761) When bands of RNA are transferred to a nitrocellulose membrane for identification, the blotting is called Show Answer

Q762) In PCR, it is _________ that creates single-stranded template molecules Show Answer

Q763) Ideally, PCR __________ increases the amount of DNA during additional cycles Show Answer

Q764) Griffith's experiment showing the transformation of R strain Pneumococcus bacteria to S strain Pneumococcus bacteria in the presence of heat-killed S strain bacteria gave evidence that Show Answer

Q765) Experiments by Avery, Macleod, and McCarty supported DNA as the genetic material by showing that Show Answer

Q766) X-ray crystallography provides information about the __________ of DNA but is limited because of the ________ of DNA. The technique is based on the pattern of __________ of the atoms in the molecule. Show Answer

Q767) Chargaff's rules of base pairing state that Show Answer

Q768) Watson and Cricks model allowed them to visualize Show Answer

Q769) A fundamental requirement for the function of genetic material is that it must be Show Answer

Q770) Evidence indicating that DNA replication was semi-conservative came from Show Answer

Q771) What are the mini-satellites? Show Answer

Q772) The primary function of DNA polymerase is to Show Answer

Q773) In gel-electrophoresis, all the DNA fragments move towards the base of the gel with variable velocities because Show Answer

Q774) Statement I : Cistron is functional unit of DNA.
Statement II : House keeping genes constantly operate for cellular activity.
Statement III : mRNA coded language is known as cryptogram Show Answer

Q775) Proofreading and repair occur Show Answer

Q776) DNA replication is an ________ process and _______ energy. Show Answer

Q777) T. aquaticus DNA polymerase is not denatured during the heat cycling required to denature DNA. This property allowed advances in what technique? Show Answer

Q778) Thirty percent of the bases in a sample DNA extracted from eukaryotic cells is adenine. What percentage of cytosine is present in this DNA? Show Answer

Q779) Which of the following represents a bond between a purine and a pyrimidine (in that order)? Show Answer

Q780) Which of the following statements about DNA replication is false? Show Answer

Q781) Which of the following would not be found in a DNA molecule? Show Answer

Q782) If a nucleotide lacking a hydroxyl group at the 3' end is added to a PCR, what would be the outcome? Show Answer

Q783) To show that DNA in cell extracts was responsible for genetic transformation in Pneumococcus, important corroborating evidence was that Show Answer

Q784) In the Hershey-Chase experiment Show Answer

Q785) Which statement about complementary base pairing is not true? Show Answer

Q786) Western Blot hybridization is used for Show Answer

Q787) Which of the following is not required for DNA replication? Show Answer

Q788) The 3' end of a DNA strand is defined as the place were Show Answer

Q789) The leading strand and lagging strand in DNA replication differ in that only on the lagging strand Show Answer

Q790) The polymerase chain reaction Show Answer

Q791) What will be the effect if both the DNA strands can be copied in transcription Show Answer

Q792) Which of the following Mendel's law has not been proved to be true in all cases ? Show Answer

Q793) Which of the following blood groups is a universal donor ? Show Answer

Q794) Identical twins come from : Show Answer