This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Biology Chapter 5 Principles Of Inheritance And Variation – Quiz 12 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 5 Principles Of Inheritance And Variation Quiz 12 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. A pleiotropic gene A) Is expressed only in primitive plants. B) Is a gene evolved during Pliocene. C) Controls a trait only in combination with another gene. D) Controls multiple traits in an individual. Show Answer Correct Answer: D) Controls multiple traits in an individual. 2. The number of gametes that are formed by a diploid organism that is heterozygous for 5 loci is ..... A) 2. B) 8. C) 16. D) 32. Show Answer Correct Answer: D) 32. 3. The crossing of F1 to any of the parent is known as A) Back cross. B) Test cross. C) Reciprocal cross. D) Multiple cross. Show Answer Correct Answer: A) Back cross. 4. 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). 5. 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). 6. The percentage of ab gamete produced by AaBb parent will be A) 25%. B) 50%. C) 75%. D) 12.5%. Show Answer Correct Answer: A) 25%. 7. 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) 1:1:1:1. B) 9:3:3:1. C) 3:1. D) 1:1. Show Answer Correct Answer: D) 1:1. 8. What is the phenotype of an individual? A) Physical appearance. B) Genetic makeup. C) Nature of the individual. D) Blended characteristics of the individual. Show Answer Correct Answer: A) Physical appearance. 9. Who coined the term 'gene'? A) Mendel. B) Johannsen. C) Morgan. D) Boveri. Show Answer Correct Answer: B) Johannsen. 10. Turner syndrome is A) 47+XXY. B) 45+XO. C) 46+XY. D) 47+XX. Show Answer Correct Answer: B) 45+XO. 11. 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. 12. 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. 13. 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) Dominant Recessive. C) Epistasis. D) Incomplete Dominance. Show Answer Correct Answer: D) Incomplete Dominance. 14. 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. 15. 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. 16. 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) 2. C) 3. D) 4. Show Answer Correct Answer: D) 4. 17. 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. 18. 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. 19. Choose the incorrect pair with respect to sex determination in different organisms. A) Grasshopper = XO type. B) Birds = ZZ-ZW type. C) Drosophila = XX-XO type. D) Human = XX-XY type. Show Answer Correct Answer: C) Drosophila = XX-XO type. 20. Starch synthesis in Pea is example of- A) Co dominance. B) Pleiotropy. C) Polygenic inheritance. D) Multiple allelism. Show Answer Correct Answer: B) Pleiotropy. 21. 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) 45. B) 22. C) 11. D) 5. Show Answer Correct Answer: D) 5. 22. 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. 23. An exception to Mendel's law is A) Linkage. B) Law of independent assortment. C) Law of segregation. D) Purity of gametes. Show Answer Correct Answer: A) Linkage. 24. What is the significance of Mendel's work in genetics? A) He discovered DNA structure. B) He established the laws of inheritance. C) He identified chromosomes. D) He invented the Punnett square. Show Answer Correct Answer: B) He established the laws of inheritance. 25. 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. ← 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 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 5 Principles Of Inheritance And Variation Quiz 9Class 12 Biology Chapter 5 Principles Of Inheritance And Variation Quiz 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books