This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Biology Chapter 5 Principles Of Inheritance And Variation – Quiz 17 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 5 Principles Of Inheritance And Variation Quiz 17 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. A sex linked disorder is A) Albinism. B) Colorblindness. C) Sickle cell anaemia. D) Phenylketonuria. Show Answer Correct Answer: B) Colorblindness. 2. Mendel crossed the tall plant from F2 generation with a dwarf plant. Mark the correct statement regarding this. A) It was conducted to determine the genotype of dwarf plant. B) It was regarded as self-crossing by Mendel. C) It was performed to determine the genotype of tall plant from F2 generation. D) Mendel conducted this to determine the total progenies in F2 generation. Show Answer Correct Answer: C) It was performed to determine the genotype of tall plant from F2 generation. 3. Which of the following statement is not correct about Incomplete dominance? A) Both the allele expresses their typical phenotypes. B) Hybrid has new phenotype but has no gene. C) There is blending of traits. D) Alleles show quantitative effect. Show Answer Correct Answer: A) Both the allele expresses their typical phenotypes. 4. In polygenic inheritance A) Many genes govern a single character. B) Heterozygous organisms express only one allele itself. C) Heterozygous organisms express both alleles. D) A single gene influences many characters. Show Answer Correct Answer: A) Many genes govern a single character. 5. Person having genotype IA IB would show the blood group as AB . This is because of: A) Pleiotropy. B) Co-dominance. C) Segregation. D) Incomplete dominance. Show Answer Correct Answer: B) Co-dominance. 6. Who discovered X-body in spermatogenesis- A) Henking. B) Gregor Mandel. C) Watson Crick. D) De Vries. Show Answer Correct Answer: A) Henking. 7. In Mendel's experiment, when tall pea plants were crossed with dwarf pea plants, F1 generation showed all tall plants (dominant trait). The recessive trait dwarfness did not get expressed because ..... A) The allele responsible, produced normal enzyme for tallness. B) The allele responsible, produced no enzyme for the expression of tallness. C) All the above. D) None of the above. Show Answer Correct Answer: B) The allele responsible, produced no enzyme for the expression of tallness. 8. Out of the 832 total plants, the number of recombinant offspring obtained in F2 generation of a dihybrid experiment is A) 468. B) 416. C) 312. D) 52. Show Answer Correct Answer: C) 312. 9. In Honeybee, no.of Chromosomes present are- A) In Female 32, In Male 16. B) 32 in both Male and Female. C) 16 in Both Male and female. D) 40 in female. Show Answer Correct Answer: A) In Female 32, In Male 16. 10. In sickle cell anaemia glutamic acid is replaced by valine. Which one ofthe following triplets codes for valine? A) GGG. B) AAG. C) GAA. D) GUG. Show Answer Correct Answer: D) GUG. 11. The distance between the genes is measured by A) Angstrom. B) Map unit. C) Dobson unit. D) Millimetre. Show Answer Correct Answer: B) Map unit. 12. Which of the following is not a characteristic of Mendel's experiment? A) Experiments had small sampling size. B) Each character of garden pea used had two opposing traits. C) Statistical analysis and mathematical logic were applied to problems in biology. D) None of the above. Show Answer Correct Answer: A) Experiments had small sampling size. 13. Study of inheritance and variation is A) Genetics. B) Evolution. C) Physyology. D) Morphology. E) Anatomy. Show Answer Correct Answer: A) Genetics. 14. In the F2 generation of a Mendelian dihybrid cross the number ofphenotypes and genotypes are: A) Phenotypes-4; genotypes-16. B) Phenotypes-9; genotypes-4. C) Phenotypes-4; genotypes-8. D) Phenotypes-4; genotypes-9. Show Answer Correct Answer: D) Phenotypes-4; genotypes-9. 15. Failure of segregation of chromatid during cell division cycle results in the gain or loss of chromosome which as called A) Aneuploidy. B) Hypopolyploidy. C) Hyperpolyploidy. D) Polyploidy. Show Answer Correct Answer: A) Aneuploidy. 16. How many types of gametes is possible with genotype AaBb A) 1. B) 2. C) 3. D) 4. Show Answer Correct Answer: D) 4. 17. Crossing over in diploid organism is responsible for A) Segregation of alleles. B) Recombination of linked alleles. C) Dominance of genes. D) Linkage between genes. Show Answer Correct Answer: B) Recombination of linked alleles. 18. The types of gametes formed by the genotype RrYy are A) RY, Ry, rY, ry. B) RY, Ry, ry, ry. C) Ry, Ry, Yy, ry. D) Rr, RR, Yy, YY. Show Answer Correct Answer: A) RY, Ry, rY, ry. 19. In a red and white-flowered cross of Mirabilis jalapa, F2 generation has red, pink and white-flowered plants in the ratio of A) 2:1:1. B) 1:1:2. C) 1:2:1. D) 1:0:1. Show Answer Correct Answer: C) 1:2:1. 20. In a cross between plants having yellow round (YYRR) and green wrinkled (yyrr) seeds, what will be the ratio between seeds having yellow and green seed colour? A) 3:2. B) 3:1. C) 9:7. D) 7:9. Show Answer Correct Answer: B) 3:1. 21. The disease sickle-cell anaemia is caused by the substitution of (i) by (ii) at the (iii) position of (iv) globin chain of haemoglobin molecule.Which of the following correctly fills the blanks in the above statement? A) (i) valine, (ii) glutamic acid, (iii) sixth, (iv) beta. B) (i) glutamic acid, (ii) valine, (iii) sixth, (iv) beta. C) (i) glutamic acid, (ii) valine, (iii) fifth, (iv) beta. D) (i) valine, (ii) glutamic acid, (iii) fifth, (iv) beta. Show Answer Correct Answer: B) (i) glutamic acid, (ii) valine, (iii) sixth, (iv) beta. 22. According to Mendel's law of segregation, what happens to the alleles during gamete formation? A) They mix with each other. B) They segregate from each other. C) They become dominant. D) They become recessive. Show Answer Correct Answer: B) They segregate from each other. 23. Mustard gas, Phenol and Ammonia are- A) Chemical Compounds. B) Chemical Mutagens. C) Physical mutagens. D) Insecticides. Show Answer Correct Answer: B) Chemical Mutagens. 24. Which of the following trait shows transmission from carrier female to male progeny? A) Autosomal dominant. B) X-linked recessive. C) Y-linked recessive. D) X-linked dominant. Show Answer Correct Answer: B) X-linked recessive. 25. Morgan found ..... of non-parental type in F2 generation in Drosophila when he made a cross between white eyed & miniature winged female with wild-type red eyed & normal winged male. A) 98.7%. B) 62.8%. C) 1.3%. D) 37.2%. Show Answer Correct Answer: D) 37.2%. ← 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