This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Biology Chapter 5 Principles Of Inheritance And Variation – Quiz 4 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 5 Principles Of Inheritance And Variation Quiz 4 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The allele which fails to express in the presence of another allele of the same character is called ..... allele. A) Dominant. B) Codominant. C) Recessive. D) Multiple. Show Answer Correct Answer: C) Recessive. 2. ..... 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. 3. 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. 4. Sickle Cell Anaemia is- A) Sex Linked Recessive Disorder. B) Autosomal DominantTrait. C) Autosomal Recessive Trait. D) Sex Linked Dominant Trait. Show Answer Correct Answer: C) Autosomal Recessive Trait. 5. 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. 6. 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. 7. 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-(iii), B-(iv), C-(ii), D-(v). B) A-(i), B-(iv), C-(ii), D-(v). C) A-(iii), B-(ii), C-(iv), D-(v). D) A-(ii), B-(v), C-(iii), D-(i). Show Answer Correct Answer: A) A-(iii), B-(iv), C-(ii), D-(v). 8. In sickle cell anaemia glutamic acid is replaced by valine. Which one of the following triplet codes for valine? A) G G G. B) A A G. C) G A A. D) G U G. Show Answer Correct Answer: D) G U G. 9. 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) 3 genotypes; 4 phenotypes. C) 4 genotypes; 3 phenotypes. D) 4 genotypes; 4 phenotypes. Show Answer Correct Answer: C) 4 genotypes; 3 phenotypes. 10. Which plant did Mendel use for his experiments on inheritance? A) Pea plant. B) Rose plant. C) Sunflower plant. D) Tulip plant. Show Answer Correct Answer: A) Pea plant. 11. (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. 12. The unit of inheritance is A) Heredity. B) Gamete. C) Gene. D) Zygote. Show Answer Correct Answer: C) Gene. 13. A plant having the genotype AABbCC will produce ..... kinds of gametes. A) 5. B) 4. C) 3. D) 2. Show Answer Correct Answer: A) 5. 14. In a monohybrid cross, what is the expected phenotypic ratio of the offspring? A) 3:1. B) 1:1. C) 1:2:1. D) 9:3:3:1. Show Answer Correct Answer: A) 3:1. 15. What are polygenic traits? A) Traits controlled by a single gene. B) Traits not controlled by any genes. C) Traits controlled by two genes. D) Traits controlled by three or more genes. Show Answer Correct Answer: D) Traits controlled by three or more genes. 16. 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, N, M, L, K. B) J, M, L, N, K. C) J, M, L, K, N. D) M, J, L, K, N. Show Answer Correct Answer: C) J, M, L, K, N. 17. Point mutation involves A) Insertion. B) Change in single base pair. C) Duplication. D) Deletion. Show Answer Correct Answer: B) Change in single base pair. 18. The recombinant phenotypic ratio in F2 obtained from parental cross having genotypes TTRR x ttrr will be A) 9:3:3:1. B) 3:1. C) 1:2:1. D) 3:36. Show Answer Correct Answer: D) 3:36. 19. 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. 20. A sequence of DNA that codes for a protein and thus determines a trait. There are hundreds of ..... on each chromosome. A) Gene. B) Phenotype. C) Genotype. D) Probability. Show Answer Correct Answer: A) Gene. 21. The use of statistical analysis and mathematical logic to problems in biology was initiated by A) James Watson. B) Francis Crick. C) Gregor mendel. D) Reginald C. Punnet. Show Answer Correct Answer: C) Gregor mendel. 22. 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. 23. Which of the following is an example of co-dominance? A) Height in pea plants. B) Flower color in snapdragons. C) Skin color in humans. D) ABO blood group in humans. Show Answer Correct Answer: D) ABO blood group in humans. 24. The genes controlling the seven pea characters studied by Mendel are now known to be located on how many different chromosomes? A) 7. B) 6. C) 5. D) 4. Show Answer Correct Answer: D) 4. 25. 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. ← PreviousNext →Related 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 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 5 Principles Of Inheritance And Variation Quiz 9Class 12 Biology Chapter 5 Principles Of Inheritance And Variation Quiz 10Class 12 Biology Chapter 5 Principles Of Inheritance And Variation Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books