This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Biology Chapter 5 Principles Of Inheritance And Variation – Quiz 18 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 5 Principles Of Inheritance And Variation Quiz 18 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Find the number of phenotypes and genotypes when TtRR is crossed with TtRr A) 2, 4. B) 2, 6. C) 4, 8. D) 16, 4. Show Answer Correct Answer: B) 2, 6. 2. Genotype of the blood group is I$^{A}$ I$^{O}$. Find the phenotype? A) A group. B) B group. C) O group. D) AB group. Show Answer Correct Answer: A) A group. 3. F$_{1}$ individual of the cross AAbb x aaBB was test crossed. If both non-allelic genes are 24 map units apart then calculate the percentage of aaBb: A) 24%. B) 12%. C) 76%. D) 38%. Show Answer Correct Answer: D) 38%. 4. The three autosomal allele that determine the blood group are located in chromosome A) 7. B) 9. C) 24. D) 1. Show Answer Correct Answer: B) 9. 5. The allele which expresses itself in both homozygous and heterozygous condition is called A) Dominant allele. B) Recessive allele. C) Incomplete dominant allele. D) Split allele. Show Answer Correct Answer: A) Dominant allele. 6. Pick out the correct statements:*******I. Haemophilia is a sex-linked recessive disease*******II. Down's syndrome is due to aneuploidy*******III. Phenylketonuria is an autosomal recessive gene disorder.*******IV. Sickle cell anaemia is a X-linked recessive gene disorder A) I and II are correct. B) II and IV are correct. C) I, II and IV are correct. D) I, II and III are correct. Show Answer Correct Answer: D) I, II and III are correct. 7. In a cross between CcPp X Ccpp, where C and P are dominant genes needed for development of purple colour flower in sweet pea plants; what would be the ratio of plants producing flowers of different colours? A) 3 purple and 5 white coloured flowers. B) 3 white and 5 purple coloured flowers. C) 2 white and 6 purple colours flowers. D) 2 purple and 6 white coloured flowers. Show Answer Correct Answer: A) 3 purple and 5 white coloured flowers. 8. A diploid organism is heterozygous for five loci and homozygous for two loci, how many types of gametes are possible? A) 14. B) 16. C) 32. D) 64. Show Answer Correct Answer: C) 32. 9. The gene that is expressed. Brown eyes are ..... over blue. A) Dominant. B) Recessive. C) Homozygous. D) Heterozygous. Show Answer Correct Answer: A) Dominant. 10. The contracting pairs of factors in Mendelian crosses are called A) Multiple alleles. B) Allelomorphs. C) Alloloci. D) Paramorphs. Show Answer Correct Answer: B) Allelomorphs. 11. If a haemophilic woman marries a normal man A) All their children will be normal. B) All their sons will be haemophilic. C) All their daughters will be haemophilic. D) 50% sons and 50% daughters will be haemophilic. Show Answer Correct Answer: B) All their sons will be haemophilic. 12. If the male plant has the genotype TT and the female plant has the genotype tt then they contribute pollen and egg, respectively with A) T and T gametes. B) Tt and TT gametes. C) TT and tt gametes. D) T and t gametes. Show Answer Correct Answer: D) T and t gametes. 13. Genes with multiple phenotypic effects are known as A) Hypostatic genes. B) Duplicate genes. C) Pleiotropic genes. D) Complementary genes. Show Answer Correct Answer: C) Pleiotropic genes. 14. How many types of gametes are formed in F1 progeny, if parent genotype is AaBB & AABB A) 2. B) 4. C) 6. D) 8. Show Answer Correct Answer: B) 4. 15. Which of the following is a characteristic of polygenic inheritance? A) Traits are inherited independently. B) Only dominant alleles are expressed. C) Multiple genes contribute to a trait. D) Single gene controls a trait. Show Answer Correct Answer: C) Multiple genes contribute to a trait. 16. Absence of one sex-chromosome causes: A) Turner's syndrome. B) Klinefelter's syndrome. C) Down's syndrome. D) Haemophilia. Show Answer Correct Answer: A) Turner's syndrome. 17. If tall pea plant (Tt) is crossed with dwarf plant(tt), which one of the following will be obtained? A) 25% recessive. B) 50% recessive. C) 75% recessive. D) No recessive. Show Answer Correct Answer: B) 50% recessive. 18. Type of inheritance where two different alleles blend together: A) Incomplete dominance. B) Sex-linked. C) Codominance. D) Multiple Alleles. Show Answer Correct Answer: A) Incomplete dominance. 19. ..... is an example of X-linked recessive trait. A) Phenylketonuria. B) Haemophilia. C) Cystic fibrosis. D) Sickle-cell anaemia. Show Answer Correct Answer: B) Haemophilia. 20. F$_{2 }$-generation in a Mendelian cross showed that both phenotypic and genotypic ratios are same as 1:2:1. It represents a case of A) Codominance. B) Dihybrid cross. C) Monohybrid cross with Complete dominance. D) Monohybrid cross with Incomplete dominance. Show Answer Correct Answer: D) Monohybrid cross with Incomplete dominance. 21. A typical 3:1 phenotypic ratio in monohybrid cross is characteristic of A) Incomplete dominance. B) Co-dominance. C) Law of dominance. D) Multiple alleles. Show Answer Correct Answer: C) Law of dominance. 22. ..... are produced by individuals having homomorphic sex-chromosomes A) One type of gametes. B) Two type of gametes. C) No gametes. D) Only one gamete in complete life span. Show Answer Correct Answer: A) One type of gametes. 23. Consider the following statement.Statement I:Substitution of glutamic acid by valine in $\beta$-globin chain of haemoglobin leads to sickle shape of RBCs.Statement II:Phenylketonuria, an autosomal recessive trait is an example of pleiotropy. A) Only statement I is true. B) Only statement II is true. C) Both the statements are true. D) Both the statements are false. Show Answer Correct Answer: C) Both the statements are true. 24. Select the correct statement from the ones given below with respect to dihybrid cross. A) Tightly linked genes on the same chromosome show higher recombinations. B) Genes far apart on the same chromosome show very few recombinations. C) Genes loosely linked on the same chromosome show similar recombinations as the tightly linked ones. D) Tightly linked genes on the same chromosome show very few recombinations. Show Answer Correct Answer: D) Tightly linked genes on the same chromosome show very few recombinations. 25. The human blood groups are determined by A) 4 alleles in which I$^{A}$ is dominant. B) 3 alleles in which I$^{A}$ and I$^{B}$ are codominant. C) 3 alleles in which none is dominant. D) 3 alleles in which I$^{A}$ and i are codominant. Show Answer Correct Answer: B) 3 alleles in which I$^{A}$ and I$^{B}$ are codominant. ← 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