This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Biology Chapter 5 Principles Of Inheritance And Variation – Quiz 8 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 5 Principles Of Inheritance And Variation Quiz 8 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. When a single gene influences more than one trait it is called A) Pseudo-dominance. B) Pleiotropy. C) Epistasis. D) None of these. Show Answer Correct Answer: B) Pleiotropy. 2. Read the given statements and select the correct option. Statement 1:Test cross is used to determine an unknown genotype within one breeding generation.Statement 2:Test cross is a cross between F$_{1 }$hybrid and dominant parent. A) Both statements 1 and 2 are correct. B) Statement 1 is correct but statement 2 is incorrect. C) Statement 1 is incorrect but statement 2 is correct. D) Both statements 1 and 2 are incorrect. Show Answer Correct Answer: B) Statement 1 is correct but statement 2 is incorrect. 3. If two genes lie very close to each other, it will show A) High degree of crossing over. B) Double crossing over. C) Low linkage. D) Nil or low crossing over. Show Answer Correct Answer: D) Nil or low crossing over. 4. A fruit fly has two genes for eye color, but each of its sperm cells has only one. This illustrates A) Independent assortment. B) Linked genes. C) Pleiotropy. D) Segregation. Show Answer Correct Answer: D) Segregation. 5. A child with mother of A group and father of AB group, will not have the following blood group- A) A. B) B. C) AB. D) O. Show Answer Correct Answer: D) O. 6. Number of pair(s) of allosome present in Humans is/are A) 22. B) 23. C) 46. D) 1. Show Answer Correct Answer: D) 1. 7. What will be the number of linkage groups in a cell having 2n = 20? A) 15. B) 40. C) 10. D) 4. Show Answer Correct Answer: C) 10. 8. XO females are A) Klinefelter's syndrome. B) Turner's syndrome. C) Patau's syndrome. D) Down's syndrome. Show Answer Correct Answer: B) Turner's syndrome. 9. A normal-visioned man whose father was colourblind, marries a woman whose father was also colourblind. They have their first child as a daughter. What are the chances that this child would be colourblind? A) 100%. B) 0%. C) 25%. D) 50%. Show Answer Correct Answer: B) 0%. 10. A cross where gametes from parental generation is reversed is called A) Test cross. B) Back cross. C) Reciprocal cross. D) Monohybrid cross. Show Answer Correct Answer: C) Reciprocal cross. 11. In a certain taxon of insects some have 17 chromosomes and the others have 18 chromosomes. The 17 and 18 chromosome bearing organisms are A) Males and females, respectively. B) Females and males, respectively. C) All males. D) All females. Show Answer Correct Answer: A) Males and females, respectively. 12. Mendel did not propose the theory of- A) Dominance. B) Incomplete dominance. C) Segregation. D) Independent assortment. Show Answer Correct Answer: B) Incomplete dominance. 13. Why is haemophilia a disease that is more commonly seen in males? A) The disease is Y-linked recessive. B) The disease is X-linked recessive. C) Both (a) and (b). D) None of the above. Show Answer Correct Answer: B) The disease is X-linked recessive. 14. Chromosomal theory of inheritance shows parallel behaviour between A) Genes and alleles. B) Genes and chromosomes. C) Chromosomes and alleles. D) Alleles and factors. Show Answer Correct Answer: B) Genes and chromosomes. 15. Strength of linkage is inversely proportional to distance between A) Chromatids. B) Telomeres. C) Genes. D) Chromosomes. Show Answer Correct Answer: C) Genes. 16. A heterozygous violet-flowered pea plant is crossed to another homozygous violet-flowered pea plant. What percent of the progeny will have the recessive trait, i.e., white? A) 0%. B) 25%. C) 50%. D) 75%. Show Answer Correct Answer: A) 0%. 17. Which one from those given below is the period of Mendel's hybridisation experiments? A) 1857-63. B) 1840-50. C) 1857-69. D) 1870-77. Show Answer Correct Answer: A) 1857-63. 18. 2 IDENTICAL alleles for the same trait. John has 2 genes for brown eyes so he is ..... A) Dominant. B) Recessive. C) Homozygous. D) Heterozygous. Show Answer Correct Answer: C) Homozygous. 19. Andalusian fowls have two pure forms-black and white. If black forms (BB) and white forms (WW) are crossed, F, individuals appear blue coloured (BW), due to incomplete dominance. Which of the following would be an outcome of a cross between black form and blue form? A) 1 Black:2 Blue:1 White. B) 2 Black:1 Blue. C) 1 Black:2 Blue. D) 1 Black:1 Blue. Show Answer Correct Answer: D) 1 Black:1 Blue. 20. Ratio of complementary genes is A) 9:3:4. B) 12:3:1. C) 9:3:3:4. D) 9:7. Show Answer Correct Answer: D) 9:7. 21. Column A ..... Column BI.Gregor Mendel ..... A.Chromosomal theory of InheritanceII.Sutton and Boveri ..... B.Law of InheritanceIII.Henking ..... C.Mendelian disorderIV.Thalassemia ..... D.Discovered x-bodyThe correct match is- A) I-B, II-A, III-D, IV-C. B) I-D, II-A, III-B, IV-C. C) I-D, II-B, III-A, IV-C. D) I-B, II-C, III-D, IV-A. Show Answer Correct Answer: A) I-B, II-A, III-D, IV-C. 22. Thalassemia in humans A) Is an autosome linked recessive blood disorder. B) Can transmit from parents to offspring when both parents are unaffected carriers (heterozygous). C) Caused due to the mutation or deletion of one of the $\alpha$ or $\beta$-globin chain. D) All of the above. Show Answer Correct Answer: D) All of the above. 23. According to Law of Segregation, what property of gametes/alleles is maintained during gametogenesis A) Dominance. B) Dependence. C) Purity. D) Blending. Show Answer Correct Answer: C) Purity. 24. .... is a type of trait whose phenotype is influenced by more than one gene. A) Oncogenic Trait. B) Monogenic trait. C) Polygenic trait. D) None of the above. Show Answer Correct Answer: A) Oncogenic Trait. 25. Which of the following is suitable for experiment on linkage? A) AaBB X aaBB. B) AABB X aabb. C) AaBb X AaBb. D) AAbb X AaBB. Show Answer Correct Answer: B) AABB X aabb. ← 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 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