This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Biology Chapter 5 Principles Of Inheritance And Variation – Quiz 10 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 5 Principles Of Inheritance And Variation Quiz 10 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. There are 3 genes a, B, C. Percentage of crossing over between a and b is 20%, B and c is 28% an a and c is 8%. What is the sequence of gene on chromosome A) B, a, c. B) A, B, c. C) A, C, b. D) None of these. Show Answer Correct Answer: A) B, a, c. 2. ABO blood groups in humans are controlled by the gene I. It has three alleles-I$^{A, }$I$^{B }$and i. since there are three different alleles, six different genotypes are posiible. How many phenotypes can occur? A) Three. B) One. C) Two. D) Four. Show Answer Correct Answer: D) Four. 3. Among the seven pairs of contrasting traits in pea plant as studied by mendel, the number of traits related to flower, pod and seed respectively were A) 2, 2, 2. B) 2, 2, 1. C) 1, 2, 2. D) 1, 2, 2. Show Answer Correct Answer: A) 2, 2, 2. 4. Mendel's experimental material was A) Drosophila melanogaster. B) Homo sapiens. C) Pisum sativum. D) Antirrhinum majus. Show Answer Correct Answer: C) Pisum sativum. 5. Alfred sturtevant work is- A) Sequencing of Human Genome Project. B) Used recombinantion frequency between gene pairs for measuring distance between genes. C) Discovered linkage. D) Explained crossing over. Show Answer Correct Answer: B) Used recombinantion frequency between gene pairs for measuring distance between genes. 6. In mice, black coat colour (allele B) is dominant to brown coat colour (allele b). The offspring of a cross between a black mouse (BB) and a brown mouse (bb) were allowed to interbreed. What percentage of the progeny would have black coats? A) 25%. B) 50%. C) 75%. D) 100%. Show Answer Correct Answer: C) 75%. 7. A simple cut in an affected individual result in non-stop bleeding. The affected individual is diagnosed with A) Sickle cell anaemia. B) Haemophilia. C) Phenylketonuria. D) Cystic fibrosis. Show Answer Correct Answer: B) Haemophilia. 8. A recessive allele is expressed in A) Heterozygous condition only. B) Homozygous condition only. C) F$_{3}$ generation. D) Both homozygous and heterozygous conditions. Show Answer Correct Answer: B) Homozygous condition only. 9. Mutation may result in A) Change in genotype. B) Change in phenotype. C) Change in metabolism. D) All of these. Show Answer Correct Answer: D) All of these. 10. A man marries a woman and both do not show any apparent traits of inherited disease. Five sons and two daughters are born, and three of their sons suffer from a disease. However, none of the daughters is affected. The following mode of inheritance for the disease is A) Sex-linked recessive. B) Sex-linked dominant. C) Autosomal dominant. D) None of the above. Show Answer Correct Answer: A) Sex-linked recessive. 11. Conditions of karyotype 2n+ ..... 1 and 2n + ..... 2 are called A) Aneuploidy. B) Polyploidy. C) Allopolyploidy. D) Monosomy. Show Answer Correct Answer: A) Aneuploidy. 12. Which of these are test cross observations? A) If the phenotype of offsprings shows only the dominant trait, then the parent plant was homozygote to the dominant trait. B) If the offsprings produced are of both phenotypes, then the parent plant was heterozygote to the dominant trait. C) Both are correct. D) None of the above. Show Answer Correct Answer: C) Both are correct. 13. Theoretically, the modified allele could be responsible for the production of I. the normal / less efficient enzymeII. a non-functional enzymeIII. no enzyme at all A) I and II are correct. B) I and III are correct. C) I, II and III are correct. D) II and III are correct. Show Answer Correct Answer: C) I, II and III are correct. 14. Phenotypic and genotypic ratio is similar in case of A) Complete dominance. B) Incomplete dominance. C) Epistasis. D) Over dominance. Show Answer Correct Answer: B) Incomplete dominance. 15. On crossing pure breeding pea plant consisting of axially placed violet colour flower with terminally placed white colour flower, 480 plants were obtained in F2 generation. What will be the number of plants considered as parental progeny in this F2 generation? A) 100. B) 200. C) 400. D) 300. Show Answer Correct Answer: D) 300. 16. ..... is called null allele A) I$^{A}$. B) I$^{B}$. C) I$^{O}$. D) None of these. Show Answer Correct Answer: C) I$^{O}$. 17. I$^{A }$allele produces ..... enzyme A) Galactosamine. B) Fructose. C) NAG. D) N acetyl galactose transferase. Show Answer Correct Answer: D) N acetyl galactose transferase. 18. Genes on same chromosome can be A) Linked. B) Homologous. C) Autosomes. D) Identical alleles. Show Answer Correct Answer: A) Linked. 19. What can be the blood group of offspring when both parents have AB blood group? A) AB only. B) A, B and AB. C) A, B, AB and O. D) A and B only. Show Answer Correct Answer: B) A, B and AB. 20. Pleiotropic genes have A) Repressed phenotype. B) Hidden phenotype. C) Multiple phenotype. D) All of these. Show Answer Correct Answer: C) Multiple phenotype. 21. The physical characteristics of an organism that is expressed. John has blue eyes and brown hair. A) Gene. B) Phenotype. C) Genotype. D) Probability. Show Answer Correct Answer: B) Phenotype. 22. Z Z / ZW type of sex determination is seen in: A) Platypus. B) Snails. C) Cockroach. D) Peacock. Show Answer Correct Answer: D) Peacock. 23. Trisomy-21 is A) Down's syndrome. B) Patau's syndrome. C) Kleinfelter's syndrome. D) Turner's syndrome. Show Answer Correct Answer: A) Down's syndrome. 24. In maize, coloured endosperm (c) is dominant over colourless (c); and full endosperm (R) is dominant over shrunken (r). When a dihybrid of F$_{1}$ generation was test crossed, it produced four phenotypes in the following percentage:Coloured full-48% Coloured shrunken-5%Colourless full-7% Colourless shrunken-40%From this data, what will be the distance between two non-allelic genes? A) 48 units. B) 5 units. C) 7 units. D) 12 units. Show Answer Correct Answer: D) 12 units. 25. What is the law of independent assortment in Mendel's laws of inheritance? A) Genes for different traits segregate independently during gamete formation. B) Genes for different traits always segregate together. C) Genes for different traits do not segregate. D) Genes for different traits segregate randomly. Show Answer Correct Answer: A) Genes for different traits segregate independently during gamete formation. ← 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 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books