This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Biology Chapter 5 Principles Of Inheritance And Variation – Quiz 6 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 5 Principles Of Inheritance And Variation Quiz 6 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. ABO blood group in man is controlled by A) Multiple allele. B) Lethal gene. C) Sex linked genes. D) Y linked genes. Show Answer Correct Answer: A) Multiple allele. 2. It is to find out the genotype of the plant showing dominant trait, the given plant is crossed with the recessive homozygote. A) Test cross. B) Dominance. C) Dominant trait. D) None of the above. Show Answer Correct Answer: A) Test cross. 3. Genetic constitution of Klinifelter's syndrome A) 44A+XXY. B) 44A+XXX. C) 44A+XO. D) 45A+XX. Show Answer Correct Answer: A) 44A+XXY. 4. Are the basic unit of inheritance and located on chromosomes. A) Inheritance. B) Genes. C) Genetics. D) Variation. Show Answer Correct Answer: B) Genes. 5. If there are four different types of nitrogenous bases (A, T, G and C) then how many different types of transitions and transversion are possible? A) Transition = 8, Transversion = 4. B) Transition = 4, Transversion = 4. C) Transition = 8, Transversion = 4. D) Transition = 4, Transversion = 8. Show Answer Correct Answer: D) Transition = 4, Transversion = 8. 6. X and Y-chromosomes are A) Only morphologically similar. B) Only morphologically dissimilar. C) Morphologically as well as genetically dissimilar. D) None are correct. Show Answer Correct Answer: C) Morphologically as well as genetically dissimilar. 7. Which of the following are chromosomal disorders. I. Colour blindness II. Down's syndrome III. Phenylketonuria IV. Turner's syndrome V. Thalassaemia A) I, II and III. B) II, IV and V. C) III, IV and V. D) II and IV. Show Answer Correct Answer: B) II, IV and V. 8. Chromosome maps/ genetic maps were first prepared by A) Sutton and Boveri (1902). B) Bateson and Punnett (1906). C) Morgan (1910). D) Sturtevant (1911). Show Answer Correct Answer: D) Sturtevant (1911). 9. Genotypic and Phenotypic ratio of incomplete dominance is- A) 1:2:1, 1:21:. B) 1:2:1, 2:4:2. C) 1:2:1, 1:1:1. D) 2:4:2, 2:4:2. Show Answer Correct Answer: A) 1:2:1, 1:21:. 10. Study the following statements on Sex Linked inheritance. Find the incorrect statement. A) Father passes X linked allele to his daughter who in turn passes to her son. B) Mother passes the allele both to her daughter and son. C) X-linked alleles are more likely to express in females than males. D) Most of the sex linked traits are recessive. Show Answer Correct Answer: C) X-linked alleles are more likely to express in females than males. 11. In certain plant, yellow fruit colour (Y) is dominant to green fruit colour (y) and round shape (R) is dominant to oval shape (r). The two genes involved are located on different chromosomes.Which of the following will result when plant YyRr is self-pollinated? A) 9:3:3:1 ratio of phenotypes only. B) 9:3:3:1 ratio of genotypes only. C) 1:1:1:1 ratio of phenotypes only. D) 1:1:1:1 ratio of phenotypes and genotypes. Show Answer Correct Answer: A) 9:3:3:1 ratio of phenotypes only. 12. If a dominant allele is present, the trait will always appear in the organism. A) Law of Segregation. B) Law of Dominance. C) Law of Independent Assortment. D) None of the above. Show Answer Correct Answer: B) Law of Dominance. 13. Monohybrid test cross ratio is A) 1:2:1. B) 3:1. C) 1:1. D) 1:3. Show Answer Correct Answer: C) 1:1. 14. Read the given statements.(i) Incomplete or mosaic inheritance is an example of pre-Mendelian concept of blending inheritance.(ii) Test cross is a special type of back cross.(iii) Chromosomal aberrations are commonly observed in cancer cells.(iv) Thalassemia is a Mendelian disorder.Which of the above statements are correct? A) (i) and (ii) only. B) (ii), (iii) and (iv) only. C) (ii) and (iv) only. D) (i) and (iv) only. Show Answer Correct Answer: C) (ii) and (iv) only. 15. If a hybrid expresses a character, is it called ..... A) Epistaxis. B) Dominant. C) Co-dominant. D) Recessive. Show Answer Correct Answer: B) Dominant. 16. Mendel's law of Independent assortment does not hold true for the genes that are located closely on A) Same chromosome. B) Non homologous chromosomes. C) X-chromosome. D) Autosome. Show Answer Correct Answer: A) Same chromosome. 17. Identify the Mendel's Law that states that though the parents contain both the alleles, during gamete formation alleles will separate and each gamete will get only one allele. A) Law of Dominance. B) Law of Independent assortment. C) Law of segregation. D) None of the above. Show Answer Correct Answer: C) Law of segregation. 18. Statement I:Combination of gametes are theoretically represented in a square tabular form known as Punnet square.Statement II:Form of genes which code for a pair of contrasting traits are known as alleles. 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. 19. A pleiogropic gene A) Controls a trait only in combination with another gene. B) Controls multiple traits in an individual. C) Is expressed only in primitive plants. D) Is a gene evolved during Pliocene. Show Answer Correct Answer: B) Controls multiple traits in an individual. 20. Find out the percentage of gametes with tr in ttRr A) 50. B) 25. C) 75. D) 100. Show Answer Correct Answer: A) 50. 21. Rate of mutation is affected by A) Temperature. B) X-rays. C) Gamma rays. D) All of these. Show Answer Correct Answer: D) All of these. 22. From the following postulation of Mendel, which one expresses the 2nd law of Mendel? A) Each character is controlled by a discrete unit called factor. B) Factors occur in pairs. C) In a dissimilar pair, only dominant factor is expressed. D) Two factors for a character are not mixed up. Both are recovered in F2 population after segregation. Show Answer Correct Answer: D) Two factors for a character are not mixed up. Both are recovered in F2 population after segregation. 23. What map unit (Centimorgan) is adopted in the construction of genetic maps? A) A unit of distance between two expressed genes representing 10% cross over. B) A unit of distance between two expressed genes representing 100% cross over. C) A unit of distance between genes on chromosomes, representing 1% cross over. D) A unit of distance between genes on chromosomes, representing 50% cross over. Show Answer Correct Answer: C) A unit of distance between genes on chromosomes, representing 1% cross over. 24. Ocassionally a single gene may express more than one effect. This phenomenon is called A) Multiple allelism. B) Mosaicism. C) Pleiotropy. D) Polygeny. Show Answer Correct Answer: C) Pleiotropy. 25. It is said that Mendel proposed that the factor controlling any character is discrete and independent. His proposition was based on the A) Results of F$_{3}$ generation of a cross. B) Observations that the offspring of a cross made between the plants having two contrasting characters shows only one character without any blending. C) Self-pollination of F$_{1}$ offsprings. D) Cross pollination of F$_{1}$ generation with recessive parent. Show Answer Correct Answer: B) Observations that the offspring of a cross made between the plants having two contrasting characters shows only one character without any blending. ← 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 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