This quiz works best with JavaScript enabled. Home > Cbse > Class 12 > Science > Biology > Class 12 Biology Chapter 5 Principles Of Inheritance And Variation – Quiz 5 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 5 Principles Of Inheritance And Variation Quiz 5 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. In maize, coloured endosperm (c) is dominant over colourless (c); and full endosperm (R) is dominant over shrunken (r). When a dihybrid of F$_{1}$ generation was test crossed, it produced four phenotypes in the following percentage:Coloured full-48% Coloured shrunken-5%Colourless full-7% Colourless shrunken-40%From this data, what will be the distance between two non-allelic genes? A) 5 units. B) 48 units. C) 12 units. D) 7 units. Show Answer Correct Answer: C) 12 units. 2. What is the law of independent assortment in Mendel's laws of inheritance? A) Genes for different traits segregate independently during gamete formation. B) Genes for different traits always segregate together. C) Genes for different traits do not segregate. D) Genes for different traits segregate randomly. Show Answer Correct Answer: A) Genes for different traits segregate independently during gamete formation. 3. The genotype of a plant showing the dominant phenotype can be determined by A) Test cross. B) Dihybrid cross. C) Back cross. D) Pedigree analysis. Show Answer Correct Answer: A) Test cross. 4. Ratio in F2-generation is explained by A) Law of purity of gametes. B) Law of dominance. C) Law of incomplete dominance. D) Law of partial dominance. Show Answer Correct Answer: B) Law of dominance. 5. PKU is caused by mutation in a gene that codes for the enzyme A) Phenyl alanine hydroxylase. B) Carboxylase. C) Urease. D) Phenyl anhydrase. Show Answer Correct Answer: A) Phenyl alanine hydroxylase. 6. Mendel's Law was rediscovered by A) Correns, Tshermak, , Morgan. B) Correns, De Vries, Morgan. C) Correns, Tshermak, , deVries. D) Correns, Tshermak, , Boveri. Show Answer Correct Answer: C) Correns, Tshermak, , deVries. 7. If a colour-blind man marries a woman who is homozygous for normal colour vision, the probability of their son being colour-blind is:- A) 0. B) 1. C) 0.75. D) 0.5. Show Answer Correct Answer: A) 0. 8. Which of the following most appropriately describes haemophilia? A) Dominant gene disorder. B) Chromosomal disorder. C) Recessive gene disorder. D) X-lnked recessive genetic disorder. Show Answer Correct Answer: D) X-lnked recessive genetic disorder. 9. A typical genotypic monohybrid ratio in Mendel's experiment is A) 1:2:1. B) 1:3:1. C) 3:1. D) 9:3:3:1. Show Answer Correct Answer: A) 1:2:1. 10. Which of the following is not the cause of Mendel's success in formulating basic principles of heredity? A) Garden pea was ideal for controlled breeding since cross pollination was easy. B) Mendel selected pea plants randomly from his garden for experiments. C) He used statistical method and laws of probability to analyse results. D) He studied inheritance of single character with two contrasting traits at a time. Show Answer Correct Answer: B) Mendel selected pea plants randomly from his garden for experiments. 11. What is the term for the genetic makeup of an organism? A) Heterozygous. B) Homozygous. C) Phenotype. D) Genotype. Show Answer Correct Answer: D) Genotype. 12. In sickle cell anemia glutamic acid is replaced by valine. Which one of the following triplets codes for valine? A) GAA. B) GUG. C) AAG. D) GGG. Show Answer Correct Answer: B) GUG. 13. T H MORGAN EXPERIMENTALLY VERIFIED CHROMOSOMAL THEORY OF INHERITANCE BY USING Drosophila melanogaster BECAUSE A) IT COMPLETES ITS LIFE CYCLE IN ABOUT TWO WEEKS. B) IT PRODUCES LARGE NUMBER OF PROGENIES IN SINGLE MATING. C) MALE IS DISTINCT FROM FEMALE. D) ALL OF THE ABOVE. Show Answer Correct Answer: D) ALL OF THE ABOVE. 14. A woman who is a carrier of a certain disease marries a man who is normal for this trait. They have five children (2 daughters and 3 sons). All sons suffer from the given disease but none of the daughters were affected as the disease show diagynic pattern. Which of the following could be this disease? A) Autosomal recessive disease. B) Sex-limited disease. C) Sex-linked disease. D) Autosomal dominant disease. Show Answer Correct Answer: C) Sex-linked disease. 15. The number of chromosomes in females and males honeybees are A) 32. B) 16. C) 32 and 16, respectively. D) 16 and 32, respectively. Show Answer Correct Answer: C) 32 and 16, respectively. 16. In a marriage between male with blood group A and female with blood group B, the progeny had either blood group AB or B. What could be the possible genotype of parents? A) I$^{A}$I$^{A}$(Male) ; I$^{B}$I$^{B}$ (Female). B) I$^{A}$ I$^{A}$ (Male) ; I$^{B}$ i (Female). C) I$^{A}$ i (Male) ; I$^{B}$ I$^{B}$(Female). D) I$^{A}$ i (Male) ; I$^{B}$ i (Female). Show Answer Correct Answer: C) I$^{A}$ i (Male) ; I$^{B}$ I$^{B}$(Female). 17. IF THE THE NUMBER OF CHROMOSOME IN QUEEN BEE IS 32 THEN WHAT WILL BE THE NUMBER OF CHROMOSOME IN WORKER BEE AND DRONE RESPECTIVELY? A) 32, 16. B) 32, 64. C) 16, 32. D) 32, 32. Show Answer Correct Answer: A) 32, 16. 18. How many of the following are Medelian disorders?Haemophilia, Cystic fibrosis, sickle cell anaemia, colour blindness, phenyl ketonuria, Thalesemia. A) 4. B) 6. C) 3. D) 5. Show Answer Correct Answer: B) 6. 19. The proportion of plants that were dwarf and tall, respectively in F2-generation of Mendel's experiment was A) $\frac{1}{4}$ $\frac{3}{4}$. B) $\frac{3}{4}$ $\frac{1}{4}$. C) $\frac{2}{3}$ $\frac{1}{3}$. D) $\frac{1}{3}$ $\frac{4}{3}$. Show Answer Correct Answer: A) $\frac{1}{4}$ $\frac{3}{4}$. 20. A polygenic inheritance in human being is A) Phenylketonuria. B) Colourblindness. C) Sickle-cell anaemia. D) Skin colour. Show Answer Correct Answer: D) Skin colour. 21. Which blood group is universal recipient? A) I$^{o}$. B) I$^{B}$. C) I$^{A}$ I$^{B}$. D) I$^{A}$. Show Answer Correct Answer: C) I$^{A}$ I$^{B}$. 22. Which of the following is not an example of recessive autosomal disease? A) Phenlketonuria. B) Cystic fibrosis. C) Haemophilia. D) Sickle-cell anaemia. Show Answer Correct Answer: C) Haemophilia. 23. Both husband and wife have normal vision though their fathers were colour blind. The probability of their daughter becoming colour blind is A) 50 %. B) 75 %. C) 0 %. D) 25 %. Show Answer Correct Answer: C) 0 %. 24. Albinism is a congenital disorder resulting from the lack of which enzyme? A) Tyrosinase. B) Fructokinase. C) Xanthine oxidase. D) Catalase. Show Answer Correct Answer: A) Tyrosinase. 25. Brown eyes are dominant over blue eyes. B-brown eyes. b-blue eyesBaby Ethan is homozygous recessive for blue eyesBaby Ethan's phenotype is ..... A) Brown eyes. B) Blue eyes. C) B B. D) B b. E) B b. Show Answer Correct Answer: B) Blue eyes. 26. A pleiotropic gene A) Is expressed only in primitive plants. B) Controls multiple traits in an individual. C) Controls a trait only in combination with another gene. D) Is a gene evolved during Pliocene. Show Answer Correct Answer: B) Controls multiple traits in an individual. 27. The number of gametes that are formed by a diploid organism that is heterozygous for 5 loci is ..... A) 32. B) 2. C) 8. D) 16. Show Answer Correct Answer: A) 32. 28. The crossing of F1 to any of the parent is known as A) Back cross. B) Reciprocal cross. C) Test cross. D) Multiple cross. Show Answer Correct Answer: A) Back cross. 29. In which of the following disorder's affected individual's possess 47 chromosomes? A) Turner's syndrome. B) Klinefelter's syndrome. C) Down's syndrome. D) Both (B) & (C). Show Answer Correct Answer: D) Both (B) & (C). 30. ABO blood grouping in human beings cites the example of A) Incomplete dominance. B) Co-dominance. C) Multiple allelism. D) Both (b) and (c). Show Answer Correct Answer: D) Both (b) and (c). 31. The percentage of ab gamete produced by AaBb parent will be A) 75%. B) 25%. C) 50%. D) 12.5%. Show Answer Correct Answer: B) 25%. 32. Two genes 'A' and 'B' are linked. In a dihybrid cross involving these twogenes, the F1 heterozygote is crossed with homozygous recessive parentaltype (aa bb). What would be the ratio of offspring in the next generation? A) 9:3:3:1. B) 1:1. C) 1:1:1:1. D) 3:1. Show Answer Correct Answer: B) 1:1. 33. What is the phenotype of an individual? A) Physical appearance. B) Genetic makeup. C) Blended characteristics of the individual. D) Nature of the individual. Show Answer Correct Answer: A) Physical appearance. 34. Who coined the term 'gene'? A) Johannsen. B) Mendel. C) Morgan. D) Boveri. Show Answer Correct Answer: A) Johannsen. 35. Turner syndrome is A) 45+XO. B) 47+XX. C) 47+XXY. D) 46+XY. Show Answer Correct Answer: A) 45+XO. 36. Major findings of Morgan's Experiment are- A) Loosely linked genes show low recombinantion and Tightly linked genes show high recombination. B) Both Tightly and Loosely linked genes show high recombination. C) Both Tightly and Loosely linked genes show low recombination. D) Tightly linked genes show low recombinantion and loosely linked genes show high recombination. Show Answer Correct Answer: D) Tightly linked genes show low recombinantion and loosely linked genes show high recombination. 37. A true breeding pea plant variety is the one that shows ..... A) Varying traits every generation after undergoing continuous cross pollination. B) Stable trait inheritance every generation after undergoing continuous self pollination. C) All the above. D) None of the above. Show Answer Correct Answer: B) Stable trait inheritance every generation after undergoing continuous self pollination. 38. Red flower (RR) flower of Antirrhinum is crossed with white flower (rr). If the offspring obtained in F1 generation is pink flower, what type of inheritance will it be called? A) Co-Dominance. B) Epistasis. C) Incomplete Dominance. D) Dominant Recessive. Show Answer Correct Answer: C) Incomplete Dominance. 39. The allele for pea comb (P) in chickens is completely dominant to the allele for single comb (p). The alleles for black feather colour (B), and white feather colour (B') show incomplete dominance, so that BB' individuals possess grey feathers. If chickens heterozygous for both pairs of genes are matched, what proportion of offspring are expected to be single combed and grey feathered? A) 9/16. B) 3/16. C) 1/16. D) 2/16. Show Answer Correct Answer: D) 2/16. 40. In Co-dominance (A) F1 generation resembles both parents (B) Genotypic and phenotypic ratios are always different (C) There is no mixing of the effect of both the alleles A) Only (A) is correct. B) Only (C) is correct. C) Both (A) and (C) are correct. D) All are correct. Show Answer Correct Answer: C) Both (A) and (C) are correct. 41. ABO blood groups in human beings are controlled by the gene I. The gene I has three alleles-lA, lB and i. Since there are three different alleles, six different genotypes are possible. How many phenotypes can occur? A) 6. B) 4. C) 3. D) 2. Show Answer Correct Answer: B) 4. 42. Genes located very close to one another on same chromosome tend to be transmitted together and are called as A) Allelomorphs. B) Identical genes. C) Linked genes. D) Recessive genes. Show Answer Correct Answer: C) Linked genes. 43. F2 Phenotypic and genotypic ratio is similar in case of A) Multiple allelism. B) Incomplete dominance. C) Polygenic inheritance. D) Epistasis. Show Answer Correct Answer: B) Incomplete dominance. 44. Choose the incorrect pair with respect to sex determination in different organisms. A) Grasshopper = XO type. B) Drosophila = XX-XO type. C) Birds = ZZ-ZW type. D) Human = XX-XY type. Show Answer Correct Answer: B) Drosophila = XX-XO type. 45. Starch synthesis in Pea is example of- A) Co dominance. B) Pleiotropy. C) Polygenic inheritance. D) Multiple allelism. Show Answer Correct Answer: B) Pleiotropy. 46. A student performed a dihybrid experiment, where he obtained 80 progenies. If the genes are independently assorted, how many numbers of progeny will be having recessive trait? A) 5. B) 11. C) 22. D) 45. Show Answer Correct Answer: A) 5. 47. When a red flowered snapdragon plant is crossed with a white flowered snapdragon plant, the F1 progeny shows ..... colored flowers. A) Red. B) Pink. C) White. D) None of the above. Show Answer Correct Answer: B) Pink. 48. An exception to Mendel's law is A) Law of independent assortment. B) Linkage. C) Purity of gametes. D) Law of segregation. Show Answer Correct Answer: B) Linkage. 49. What is the significance of Mendel's work in genetics? A) He invented the Punnett square. B) He discovered DNA structure. C) He identified chromosomes. D) He established the laws of inheritance. Show Answer Correct Answer: D) He established the laws of inheritance. 50. One gene for the type of earlobes a person will have will be in each gamete. A) Law of Dominance. B) Law of Independent Assortment. C) Law of Segregation. D) None of the above. Show Answer Correct Answer: C) Law of Segregation. 51. How many pairs of contrasting characters in pea plants were studied by Mendel in his experiments? A) Seven. B) Eight. C) Five. D) Six. Show Answer Correct Answer: A) Seven. 52. A trait that "overpowers" and hide another trait is called: A) Recessive trait. B) Complex trait. C) Overpowering trait. D) Dominant Trait. Show Answer Correct Answer: D) Dominant Trait. 53. Which of the following disorders is an example of a chromosomal disorder? A) Thalassaemia. B) Sickle cell anemia. C) Phenylketonuria. D) Down's syndrome. Show Answer Correct Answer: D) Down's syndrome. 54. In 3200 progeny obtained in F2 Generation of cross between pure tall round and dwarf wrinkled then number of pure recessive progeny is A) 200. B) 300. C) 100. D) 400. Show Answer Correct Answer: A) 200. 55. Law of independent assortment can be explained with the help of A) Dihybride. B) Test cross. C) Back cross. D) Monohybride cross. Show Answer Correct Answer: A) Dihybride. 56. The possibility of a female becoming hameophilic is extremely rare because mother of such a female has to be at least (i) and father should be (ii). A) (i) haemophilic, (ii) haemophilic. B) (i) haemophilic, (ii) normal. C) (i) carrier, (ii) haemophilic. D) (i) haemophilic, (ii) carrier. Show Answer Correct Answer: C) (i) carrier, (ii) haemophilic. 57. A child has blood group 'O'. If father has blood group 'A' and mother has blood group 'B', work out the genotypes of the parents. A) |$^{A}$|$^{A}$ and l$^{B}$i. B) |$^{A}$i and l$^{B}$i. C) L$^{A}$i and ii. D) Ii and l$^{B}$l$^{B}$. Show Answer Correct Answer: B) |$^{A}$i and l$^{B}$i. 58. In an albino the number of melanocytes are normal. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 59. Phenylketonuria (PKU) is an inherited disease which refers to A) Decrease in phenylalanine in tissue and blood. B) Increase in phenyl pyruvic acid in tissue and blood. C) Elimination of sugar in urine. D) Elimination of uric acid in urine. Show Answer Correct Answer: B) Increase in phenyl pyruvic acid in tissue and blood. 60. The total number of pure lines prepared by Mendel for his hybridization experiment in Pisum sativum was A) 14. B) 2. C) 7. D) 34. Show Answer Correct Answer: A) 14. ← PreviousNext →Related QuizzesScience QuizzesClass 12 QuizzesClass 12 Biology Chapter 5 Principles Of Inheritance And Variation Quiz 1Class 12 Biology Chapter 5 Principles Of Inheritance And Variation Quiz 2Class 12 Biology Chapter 5 Principles Of Inheritance And Variation Quiz 3Class 12 Biology Chapter 5 Principles Of Inheritance And Variation Quiz 4Class 12 Biology Chapter 5 Principles Of Inheritance And Variation Quiz 6Class 12 Biology Chapter 5 Principles Of Inheritance And Variation Quiz 7Class 12 Biology Chapter 5 Principles Of Inheritance And Variation Quiz 8Class 12 Biology Chapter 1 Reproduction In Organisms Quiz 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books