This quiz works best with JavaScript enabled. Home > Class 12 > 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 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Which of the following statement correctly explains the four type of phenotypes in the ratio of 9:3:3:1 in a dihybrid cross? A) Independent assortment of factors controlling the traits. B) Recombination between linked genes. C) Mutations in genes of seed shape and colour. D) None of the above. Show Answer Correct Answer: A) Independent assortment of factors controlling the traits. 2. What is true about the crossing over between linked genes? A) No crossing over at all. B) High percentage of crossing over. C) Hardly and crossing over. D) None of these. Show Answer Correct Answer: C) Hardly and crossing over. 3. A character that appears in a homozygous condition is called A) Genotype. B) Heterozygous. C) Phenotype. D) Recessive. Show Answer Correct Answer: D) Recessive. 4. Which one of the following Mendelian traits can be expressed in the presence of its identical allele only? A) Green pod. B) Axial flower. C) Constricted pod. D) Round seed. Show Answer Correct Answer: C) Constricted pod. 5. Point mutation may occur due to A) Alteration in DNA sequence. B) Change in a single base pair of DNA. C) Deletion of a segments of DNA. D) Gain of a segment in DNA. Show Answer Correct Answer: B) Change in a single base pair of DNA. 6. The genetic makeup of an organism. John has 2 genes that are homozygous recessive for eye color \{e e \} A) Gene. B) Phenotype. C) Genotype. D) Probability. Show Answer Correct Answer: C) Genotype. 7. In mendelian dihybride cross, when heterozygous round yellow are self-crossed, round green offspring are represented by the genotype. A) RrYy, RrYY, RRYy. B) Rryy, RRyy. Rryy. C) RrYy, rrYY. D) Rryy, RRyy. Show Answer Correct Answer: D) Rryy, RRyy. 8. Assertion:At F2 stage in monohybrid cross, both parental traits are expressed in the proportion of 3:1.Reason:The contrasting parental traits show blending at F2 stage. 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. 9. What are the genes that are passed from parents to offspring called? A) Alleles. B) Chromosomes. C) Genotypes. D) Phenotypes. Show Answer Correct Answer: A) Alleles. 10. What would be blood groups of heterozygous father with blood group B & mother homozygous for A? A) A & B. B) AB & A. C) AB only. D) AB & B. Show Answer Correct Answer: B) AB & A. 11. A cross between AA and aa will produce an F1 progeny A) Genotypically aa phenotypically A. B) Genotypically AA phenotypically a. C) Genotypically Aa phenotypically A. D) Genotypically Aa phenotypically a. Show Answer Correct Answer: C) Genotypically Aa phenotypically A. 12. When F1 hybrids crossed with either of the parent, it is called A) Monohybrid cross. B) Dihyhybrid cross. C) Back cross. D) Test cross. Show Answer Correct Answer: C) Back cross. 13. Linkage reduces the frequency of A) Hybrids. B) All parental types. C) Homozygous recessive parents. D) Heterozygous recessive parents. Show Answer Correct Answer: A) Hybrids. 14. An individual's collection of genes is called ..... A) Genotype. B) Phenotype. C) Trait. D) None of the above. Show Answer Correct Answer: A) Genotype. 15. To determine the genotype of tall plant of F$_{2}$ generation, Mendel crossed this plant with a dwarf plant. This cross represents a A) Test cross. B) Monohybrid cross. C) Dihybrid cross. D) Reciprocal cross. Show Answer Correct Answer: A) Test cross. 16. A marriage between a colourblind man and a normal woman produces. A) All carrier daughters and normal sons. B) 50% carrier daughters, 50% normal daughters. C) 50% colourblind sons, 50% normal sons. D) All carrier offsprings. Show Answer Correct Answer: A) All carrier daughters and normal sons. 17. Blood group in Humans is an example of A) Incomplete dominance. B) Co-dominance. C) Multiple alleles. D) Both 2 & 3. Show Answer Correct Answer: D) Both 2 & 3. 18. All genes located on the same chromosome A) Forms different groups depending upon their relative distance. B) Form one linkage group. C) Will not form any linkage groups. D) Forms interactive group that affect the phenotype. Show Answer Correct Answer: B) Form one linkage group. 19. When Aa is crossed with aa A-dominanta-recessive A) All the offsprings will have dominant phenotype. B) All the offsprings will have recessive phenotype. C) 50% of the offsprings will have dominant phenotype while 50% will be recessive phenotypically. D) 75% of the offsprings will have dominant phenotype while 25% will be recessive phenotypically. Show Answer Correct Answer: C) 50% of the offsprings will have dominant phenotype while 50% will be recessive phenotypically. 20. The cross between white eyed female Drosophila and a red eyed male Drosophila would lead to the production of A) Red eyed males and red eyed females. B) White eyed males and white eyed females. C) Red eyed females and white eyed males. D) White eyed males and red eyed females. Show Answer Correct Answer: C) Red eyed females and white eyed males. 21. In a dihybrid cross if you get 9:3:3:1 ratio, it denotes that A) The alleles of two genes are interacting with each other. B) Its multigenic inheritance. C) It exhibits multiple allelism. D) The alleles of two genes are segregating independently. Show Answer Correct Answer: D) The alleles of two genes are segregating independently. 22. The weight of fruit in a plant is determined by the number of dominant alleles of a certain number of genes. If nine weight categories are noticed, how many gene loci would be involved? A) 2. B) 3. C) 4. D) 5. Show Answer Correct Answer: C) 4. 23. How many types of gametes can be produced by a diploid organism who is heterozygous for loci? A) 4. B) 8. C) 16. D) 32. Show Answer Correct Answer: C) 16. 24. The two polynucleotide chains in DNA are A) Discontinous. B) Antiparrallel. C) Semi conservative. D) Parallel. Show Answer Correct Answer: B) Antiparrallel. 25. The exposure of X rays enhances the frequency of A) Linkage. B) Crossing over. C) Pairing of chromosomes. D) Segregation. Show Answer Correct Answer: B) Crossing over. ← PreviousNext →Related 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 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