This quiz works best with JavaScript enabled. Home > Cbse > Class 12 > Science > Biology > Class 12 Biology Chapter 5 Principles Of Inheritance And Variation – Quiz 2 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 5 Principles Of Inheritance And Variation Quiz 2 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Gynaecomastia condition is result of- A) Edward's Syndrome. B) Klinefelter's Syndrome. C) Turner's Syndrome. D) Down's Syndrome. Show Answer Correct Answer: B) Klinefelter's Syndrome. 2. If the father is haemophilic and mother is normal, then the daughter will have chance to A) Be carrier of haemophilia. B) Be haemophilic. C) Not receive any gene of haemophilia any time. D) Be normal always. Show Answer Correct Answer: A) Be carrier of haemophilia. 3. Bateson used the terms coupling and repulsion for linkage and crossing over. Name the correct parental or coupling type along with its cross over or repulsion: A) Coupling AABB, aabb; Repulsion AABB, AAbb. B) Coupling AABB, aabb; Repulsion AAbb, aaBB. C) Coupling AAbb, aaBB; Repulsion AaBb, aabb. D) Coupling aaBB, aabb; Repulsion AABB, aabb. Show Answer Correct Answer: B) Coupling AABB, aabb; Repulsion AAbb, aaBB. 4. It is said that Mendel proposed that the factor controlling any characteris discrete and independent. His proposition was based on the A) Cross pollination of F1 generation with recessive parent. B) Results of F3 generation of a cross. C) Observations that the offspring of a cross made between the plants having two contrasting characters shows only one character without any blending. D) Self pollination of F1 offsprings. Show Answer Correct Answer: C) Observations that the offspring of a cross made between the plants having two contrasting characters shows only one character without any blending. 5. Which of the following is/are possible for a modified allele? A) Can produce no enzyme. B) Can produce a non-functional enzyme. C) Can produce an altered and functional product. D) All (i), (ii) & (iii). Show Answer Correct Answer: D) All (i), (ii) & (iii). 6. The linkage group(s) of a human sperm and egg is A) 23 each. B) 24 and 23 respectively. C) 23 and 24 respectively. D) 22 and 23 respectively. Show Answer Correct Answer: A) 23 each. 7. A tobacco plant heterozygous for a recessive character is self-pollinated and 1200 seeds are subsequently germinated. How many seedlings would have the parental genotype? A) 300. B) 600. C) 750. D) 120. Show Answer Correct Answer: B) 600. 8. Experimental verification of 'chromosomal theory of inheritance' was done by A) Sutton and Boveri. B) Morgan et al. C) Henking. D) Karl Correns. Show Answer Correct Answer: B) Morgan et al. 9. A couple has six daughters. What is the possibility of their having a girl next time? A) 90%. B) 10%. C) 50%. D) 100%. Show Answer Correct Answer: C) 50%. 10. What is the expected outcome of a test cross? A) To identify linked genes. B) To create a new hybrid organism. C) To analyze a pedigree chart. D) To determine the genotype of an individual with a dominant phenotype. Show Answer Correct Answer: D) To determine the genotype of an individual with a dominant phenotype. 11. THERE ARE 6 GENOTYPES TO REPRESENT 4 BLOOD GROUPS IN HUMAN BEINGS.WHICH ONE OF THE FOLLOWING GENOTYPES SHOWS CODOMINANCE A) I$^{A}$I$^{A}$. B) I$^{A}$I. C) I$^{A}$I$^{B}$. D) I$^{B}$I$^{B}$. Show Answer Correct Answer: C) I$^{A}$I$^{B}$. 12. An affected female shows following symptomsi.Rudimentary ovaries ii.Sterility iii.Lack of secondary sexual charactersThe affected female is diagnosed with A) Cystic fibrosis. B) Turner's syndrome. C) Phenylketonuria. D) Klinefelter's syndrome. Show Answer Correct Answer: B) Turner's syndrome. 13. It is used to stop the cell division at metaphase of karyotyping. A) Colchicine. B) Sebum. C) Melatonin. D) Renin. Show Answer Correct Answer: A) Colchicine. 14. A human female with Turner's syndrome A) Has 45 chromosomes with XO. B) Has one additional X-chromosome. C) Exhibits male characters. D) Is able to produce children with normal husband. Show Answer Correct Answer: A) Has 45 chromosomes with XO. 15. The allele which fails to express in the presence of another allele of the same character is called ..... allele. A) Recessive. B) Multiple. C) Dominant. D) Codominant. Show Answer Correct Answer: A) Recessive. 16. ..... code for a pair of contrasting traits of same gene. A) Dominant genes. B) Alleles. C) Linked genes. D) Recessive genes. Show Answer Correct Answer: B) Alleles. 17. Which of the following best describes pleiotropy? A) One gene affects multiple traits. B) Multiple genes affect one trait. C) The inheritance of traits through sex chromosomes. D) A gene that has multiple alleles. Show Answer Correct Answer: A) One gene affects multiple traits. 18. Sickle Cell Anaemia is- A) Sex Linked Recessive Disorder. B) Autosomal Recessive Trait. C) Autosomal DominantTrait. D) Sex Linked Dominant Trait. Show Answer Correct Answer: B) Autosomal Recessive Trait. 19. Persons having genotype I$^{A}$I$^{B }$would show the blood group AB. This is because of A) Pleiotropy. B) Co-dominanace. C) Segregation. D) Incomplete dominanace. Show Answer Correct Answer: B) Co-dominanace. 20. Which of the following is correct for the condition when plant YyRr is back crossed with the double recessive parent? A) 9:3:3:1 ratio of phenotypes only. B) 9:3:3:1 ratio of genotypes only. C) 1:1:1:1 ratio of phenotypes only. D) 1:1:1:1 ratio of phenotypes and genotypes. Show Answer Correct Answer: D) 1:1:1:1 ratio of phenotypes and genotypes. 21. Match column I with column II and select the correct option from the given codes. Column I Column IIA Dihybrid test cross (i) 9:3:3:1B Law of segregation (ii) Dihybrid crossC Law of independent (iii) 1:1:1:1 assortmentD ABO blood group (iv) Purity of gametes in man (v) Multiple allelism A) A-(ii), B-(v), C-(iii), D-(i). B) A-(iii), B-(ii), C-(iv), D-(v). C) A-(i), B-(iv), C-(ii), D-(v). D) A-(iii), B-(iv), C-(ii), D-(v). Show Answer Correct Answer: D) A-(iii), B-(iv), C-(ii), D-(v). 22. In sickle cell anaemia glutamic acid is replaced by valine. Which one of the following triplet codes for valine? A) A A G. B) G G G. C) G U G. D) G A A. Show Answer Correct Answer: C) G U G. 23. The genotypes of a Husband and Wife are IAIB and IAi .Among the blood types of their children how many different genotypes and phenotypes are possible A) 3 genotypes; 3 phenotypes. B) 4 genotypes; 4 phenotypes. C) 4 genotypes; 3 phenotypes. D) 3 genotypes; 4 phenotypes. Show Answer Correct Answer: C) 4 genotypes; 3 phenotypes. 24. Which plant did Mendel use for his experiments on inheritance? A) Sunflower plant. B) Pea plant. C) Tulip plant. D) Rose plant. Show Answer Correct Answer: B) Pea plant. 25. (A) Pleiotropic genes have multiple phenotypic effect (B) Multiple alleles have same gene locus (C) Polygenes exhibit continuous variation. A) Statement (A), (B) and (C) are correct. B) Statement (A), (C) correct and (B) is incorrect. C) Statement (A), (B) and (C) are incorrect. D) Statement (B) and (C) are correct and (A) is incorrect. Show Answer Correct Answer: A) Statement (A), (B) and (C) are correct. 26. The unit of inheritance is A) Gamete. B) Heredity. C) Gene. D) Zygote. Show Answer Correct Answer: C) Gene. 27. A plant having the genotype AABbCC will produce ..... kinds of gametes. A) 4. B) 5. C) 3. D) 2. Show Answer Correct Answer: B) 5. 28. In a monohybrid cross, what is the expected phenotypic ratio of the offspring? A) 9:3:3:1. B) 1:2:1. C) 1:1. D) 3:1. Show Answer Correct Answer: D) 3:1. 29. What are polygenic traits? A) Traits controlled by a single gene. B) Traits controlled by two genes. C) Traits not controlled by any genes. D) Traits controlled by three or more genes. Show Answer Correct Answer: D) Traits controlled by three or more genes. 30. The cross over percentage between linked genes J and M is 20%, J and L is 35%, J and N is 70%, L and K is 15%, M and N is 50%, and M and L is 15%. Thus, the sequences of genes on the chromosomes is A) J, M, L, K, N. B) M, J, L, K, N. C) J, N, M, L, K. D) J, M, L, N, K. Show Answer Correct Answer: A) J, M, L, K, N. 31. Point mutation involves A) Deletion. B) Change in single base pair. C) Duplication. D) Insertion. Show Answer Correct Answer: B) Change in single base pair. 32. The recombinant phenotypic ratio in F2 obtained from parental cross having genotypes TTRR x ttrr will be A) 3:36. B) 9:3:3:1. C) 1:2:1. D) 3:1. Show Answer Correct Answer: A) 3:36. 33. In a pedigree analysis, a mutation in recessive gene would be expressed only in A) Recessive homozygous condition. B) Recessive heterozygous condition. C) Dominant homozygous condition. D) Both (a) and (b). Show Answer Correct Answer: A) Recessive homozygous condition. 34. A sequence of DNA that codes for a protein and thus determines a trait. There are hundreds of ..... on each chromosome. A) Gene. B) Probability. C) Phenotype. D) Genotype. Show Answer Correct Answer: A) Gene. 35. The use of statistical analysis and mathematical logic to problems in biology was initiated by A) James Watson. B) Gregor mendel. C) Francis Crick. D) Reginald C. Punnet. Show Answer Correct Answer: B) Gregor mendel. 36. The subject that deals with inheritance and variation is called ..... A) Heredity. B) Variation. C) Genetics. D) None of the above. Show Answer Correct Answer: C) Genetics. 37. Which of the following is an example of co-dominance? A) Height in pea plants. B) Skin color in humans. C) Flower color in snapdragons. D) ABO blood group in humans. Show Answer Correct Answer: D) ABO blood group in humans. 38. The genes controlling the seven pea characters studied by Mendel are now known to be located on how many different chromosomes? A) 7. B) 5. C) 4. D) 6. Show Answer Correct Answer: C) 4. 39. Assertion:The law of independent assortment can be studied by means of dihybrid cross.Reason:The law of independent assortment is applicable only to linked genes. A) Both Assertion and Reason are true and the Reason is the correct explanation of the Assertion. B) Both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion. C) Assertion is true but Reason is false. D) Both Assertion and Reason are false. Show Answer Correct Answer: C) Assertion is true but Reason is false. 40. Mark the odd one out with respect to the Law of Dominance A) Alternate forms of factors exist in pairs. B) Opposite pairs of factors are responsible for a character. C) The alternative forms of factors show codominance. D) Factors control every character of the body. Show Answer Correct Answer: C) The alternative forms of factors show codominance. 41. The chromosome constitution 2n-2 of an organism represents A) Nullisomic. B) Haploid. C) Trisomic. D) Monosomic. Show Answer Correct Answer: A) Nullisomic. 42. Which of the following are reasons for Mendel's success?(i) Usage of pure lines or pure breeding varieties(ii) Consideration of one character at a time(iii) Maintenance of statistical records of experiments(iv) Knowledge of linkage and incomplete dominance A) (i) and (ii) only. B) (i), (ii) and (iii). C) (i) and (iv) only. D) (ii), (iii) and (iv). Show Answer Correct Answer: B) (i), (ii) and (iii). 43. Of the seven characters studied by Mendel, which of the following trait mentioned below is incorrect? A) Green colour pod is a recessive trait. B) Green colour seed is a recessive trait. C) Wrinkled seed is a recessive trait. D) Axillary flower is dominant trait. Show Answer Correct Answer: A) Green colour pod is a recessive trait. 44. The frequency of recombination between gene pairs on the same chromosome as a measure of the distance between genes was explained by: A) T.H. Morgan. B) Alfred Sturtevant. C) Gregor J. Mendel. D) Sutton Boveri. Show Answer Correct Answer: B) Alfred Sturtevant. 45. How many types of gametes will be produced by individuals of AABbcc genotype? A) Nine. B) Two. C) Four. D) Six. Show Answer Correct Answer: B) Two. 46. A blue fowl obtained from mating between black and white fowls, is self-crossed. The F2 ratio is A) 1 black:2 white:1 blue. B) 1 black:2 blue:1 white. C) 2 black:1 white:1 blue. D) None of these. Show Answer Correct Answer: B) 1 black:2 blue:1 white. 47. Find out the mismatched pair. A) Turner's syndrome-Y-linked. B) Haemophilia-sex linked recessive. C) Down's syndrome-Trisomy 21. D) Cystic fibrosis-Autosomal recessive. Show Answer Correct Answer: A) Turner's syndrome-Y-linked. 48. Mark the incorrect statement regarding Klinefelter's syndrome. A) Caused due to failure of segregation of chromatids during cell division. B) It is an example of mendelian disorder. C) Karyotype of individual is 47, XXY. D) The individual is sterile with feminine characters. Show Answer Correct Answer: B) It is an example of mendelian disorder. 49. On selfing a heterozygous round and yellow seeded plants, the production of heterozygous for both the traits would be A) 4/16. B) 9/16. C) 3/16. D) 1/16. Show Answer Correct Answer: A) 4/16. 50. In honeybees, females are (i) having (ii) chromosomes and males are (iii) having (iv) chromosomes. A) (i) diploid (ii) 32 (iii) haploid (iv) 16. B) (i) haploid (ii) 23 (iii) diploid (iv)46. C) (i) diploid (ii) 46 (iii) haploid (iv) 23. D) (i) haploid (ii) 16 (iii) diploid (iv) 32. Show Answer Correct Answer: A) (i) diploid (ii) 32 (iii) haploid (iv) 16. 51. If the child's blood group is O, father's blood group is A and mother's blood group is B. then the genotype of the parents will be A) I$^{A}$ I$^{A}$ and I$^{B }$I$^{O}$. B) I$^{A}$ I$^{o}$ and I$^{B}$ I$^{O}$. C) I$^{A}$ I$^{O}$ and I$^{O}$ I$^{O}$. D) I$^{O}$ I$^{O }$ and I$^{B}$ I$^{B}$. Show Answer Correct Answer: B) I$^{A}$ I$^{o}$ and I$^{B}$ I$^{O}$. 52. Select the incorrect statement with regard to haemophilia. A) It is a dominant disease. B) It is a sex-linked disease. C) A single protein involved in the clotting of blood is affected. D) It is a recessive disease. Show Answer Correct Answer: A) It is a dominant disease. 53. What is the law of dominance in Mendel's laws of inheritance? A) The dominant allele is always expressed over the recessive allele. B) The recessive allele is always expressed over the dominant allele. C) Both alleles are expressed equally. D) There is no dominance in alleles. Show Answer Correct Answer: A) The dominant allele is always expressed over the recessive allele. 54. The gene disorder phenylketonuria is an example for A) Multiple allelism. B) Polygenic inheritance. C) Multiple factor. D) Pleiotropy. Show Answer Correct Answer: D) Pleiotropy. 55. If the D allele is completely dominant over the d allele, what percentage of the offspring will have the dominant phenotype when Dd and Dd individuals mate? A) 25%. B) 50%. C) 75%. D) 100%. Show Answer Correct Answer: C) 75%. 56. What theory was coined by Sutton and Boveri? A) Chromosomal theory of genetics. B) Genetic theory of inheritance. C) Chromosomal theory of inheritance. D) Universal theory of recombination. Show Answer Correct Answer: C) Chromosomal theory of inheritance. 57. In XX and XY type of sex-determination A) Males are heterogametic. B) Females are isogametic. C) Both (a) and (b). D) None of the option is correct. Show Answer Correct Answer: A) Males are heterogametic. 58. Which of Mendel's laws states that alleles are separated during meiosis? A) Law of Dominance. B) Law of Segregation. C) Law of Independent Assortment. D) None of the above. Show Answer Correct Answer: B) Law of Segregation. 59. Which one of the following traits studied by Mendel, was recessive? A) Green pod colour. B) Round seed shape. C) Green seed colour. D) Axial flower position. Show Answer Correct Answer: C) Green seed colour. 60. A tall true breeding plant is crossed with a dwarf true breeding plant. When the F1 plants were selfed the resulting genotypes were in the ratio of A) 1:2:1::tall heterozygous:tall homozygous:dwarf. B) 3:1::tall:dwarf. C) 3:1::dwarf:tall. D) 1:2:1::tall homozygous:tall heterozygous:dwarf. Show Answer Correct Answer: D) 1:2:1::tall homozygous:tall heterozygous:dwarf. ← 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 3Class 12 Biology Chapter 5 Principles Of Inheritance And Variation Quiz 4Class 12 Biology Chapter 5 Principles Of Inheritance And Variation Quiz 5Class 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