This quiz works best with JavaScript enabled. Home > Cbse > Class 12 > Science > Biology > Class 12 Biology Chapter 5 Principles Of Inheritance And Variation – Quiz 8 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 5 Principles Of Inheritance And Variation Quiz 8 (54 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. 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. 2. Genes with multiple phenotypic effects are known as A) Pleiotropic genes. B) Complementary genes. C) Duplicate genes. D) Hypostatic genes. Show Answer Correct Answer: A) Pleiotropic genes. 3. How many types of gametes are formed in F1 progeny, if parent genotype is AaBB & AABB A) 6. B) 8. C) 4. D) 2. Show Answer Correct Answer: C) 4. 4. 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. 5. Absence of one sex-chromosome causes: A) Turner's syndrome. B) Haemophilia. C) Klinefelter's syndrome. D) Down's syndrome. Show Answer Correct Answer: A) Turner's syndrome. 6. If tall pea plant (Tt) is crossed with dwarf plant(tt), which one of the following will be obtained? A) 75% recessive. B) 50% recessive. C) No recessive. D) 25% recessive. Show Answer Correct Answer: B) 50% recessive. 7. 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. 8. ..... is an example of X-linked recessive trait. A) Haemophilia. B) Sickle-cell anaemia. C) Phenylketonuria. D) Cystic fibrosis. Show Answer Correct Answer: A) Haemophilia. 9. 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) Monohybrid cross with Incomplete dominance. B) Codominance. C) Monohybrid cross with Complete dominance. D) Dihybrid cross. Show Answer Correct Answer: A) Monohybrid cross with Incomplete dominance. 10. 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. 11. ..... are produced by individuals having homomorphic sex-chromosomes A) No gametes. B) Two type of gametes. C) Only one gamete in complete life span. D) One type of gametes. Show Answer Correct Answer: D) One type of gametes. 12. 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. 13. 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) Tightly linked genes on the same chromosome show very few recombinations. C) Genes far apart on the same chromosome show very few recombinations. D) Genes loosely linked on the same chromosome show similar recombinations as the tightly linked ones. Show Answer Correct Answer: B) Tightly linked genes on the same chromosome show very few recombinations. 14. 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. 15. A women with 57 chromosomes due to three copies of chromosome 21 is characterized by A) Turner's syndrome. B) Triploidy. C) Down's syndrome. D) Superfemaleness. Show Answer Correct Answer: C) Down's syndrome. 16. Position of a gene on chromosome is called A) Cistron. B) Nucleosome. C) Locus. D) Factor. Show Answer Correct Answer: C) Locus. 17. How many true-breeding plant varieties of pea were selected by Mendel for his experiments? A) 10. B) 5. C) 7. D) 14. Show Answer Correct Answer: D) 14. 18. Inheritance of skin colour in human beings is an example of- A) Polygenic inheritance. B) Complementary genes. C) Monogenic inheritance. D) Mendelian inheritance. Show Answer Correct Answer: A) Polygenic inheritance. 19. Which three scientists independently rediscovered mendel's work? A) Avery, Mcleod, McCarty. B) Sutton, Morgan and Bridges. C) Bateson, Punnet and Bridges. D) De Vries, Correns and Tschermak. Show Answer Correct Answer: D) De Vries, Correns and Tschermak. 20. Column AColumn BI.Gene ..... A.HomozygoteII.TT ..... B.DNAIII. Alternate form of gene ..... C.Dihybrid crossIV.TtRr x TtRr ..... D.AlleleThe correct match is- A) I-B, II-C, III-D, IV-A. B) I-B, II-A, III-D, IV-C. C) I-D, II-B, III-A, IV-C. D) I-D, II-A, III-B, IV-C. Show Answer Correct Answer: B) I-B, II-A, III-D, IV-C. 21. Choose the option that shows recessive traits in pea plant A) Tall height. B) Violet flower. C) Axial flower position. D) Green seed colour. Show Answer Correct Answer: D) Green seed colour. 22. Which is an autosomal dominant disorder A) Huntington's chorea. B) Phenylketonuria. C) Albinism. D) Thalassemia. Show Answer Correct Answer: A) Huntington's chorea. 23. In human beings, multiple genes are involved in the inheritance of A) Sickle cell Anaemia. B) Phenylketonuria. C) Colour blindness. D) Skin colour. Show Answer Correct Answer: D) Skin colour. 24. Christmas disease is another name for A) Hemophilia. B) Hepatitis B. C) Sleeping sickness. D) Down's syndrome. Show Answer Correct Answer: A) Hemophilia. 25. If the modified allele is equivalent to the unmodified allele, it results in A) Same phenotype. B) Transformation of substrate. C) Different phenotype. D) Both a and b. Show Answer Correct Answer: D) Both a and b. 26. Infectious proteins are present in A) Prions. B) Viroids. C) Satellite viruses. D) Gemini viruses. Show Answer Correct Answer: A) Prions. 27. Distance between the gene and percentage of recombination shows A) A direct relationship. B) An inverse relationship. C) A parallel relationship. D) No relationship. Show Answer Correct Answer: A) A direct relationship. 28. Which of the following will not result in variations among siblings? A) Linkage. B) Mutation. C) Crossing over. D) Independent assortment of genes. Show Answer Correct Answer: A) Linkage. 29. Vehicles of heredity are- A) Genes. B) Factors. C) Chromosomes. D) Chromatin. Show Answer Correct Answer: C) Chromosomes. 30. Analysis of traits of several generation of a family in the form of diagram is called A) Gene analysis. B) Chromosome analysis. C) Allele analysis. D) Pedigree analysis. Show Answer Correct Answer: D) Pedigree analysis. 31. What is the definition of linkage in genetics? A) The process of crossing over. B) The tendency of genes to be inherited together. C) The mutation of genes. D) The separation of alleles during gamete formation. Show Answer Correct Answer: B) The tendency of genes to be inherited together. 32. Human skin colour and Human height are examples of- A) Pleiotropy. B) Polygenic inheritance. C) Codominance. D) Multiple allelism. Show Answer Correct Answer: B) Polygenic inheritance. 33. How many maximum different types of gametes can be formed by a diploid organism if it is homozygous for one locus and heterozygous for three loci? A) 2. B) 4. C) 6. D) 8. Show Answer Correct Answer: D) 8. 34. In a population of 960 progenies obtained as a result of monohybrid cross between two axially and terminally placed flower in Pisum sativum. Assuming complete segregation in the gamete formation, how many progenies will be having terminally located flowers? A) 143. B) 720. C) 240. D) 480. Show Answer Correct Answer: C) 240. 35. A cross between two tall plants resulted in offspring having few dwarfplants. What would be the genotypes of both the parents? A) TT and Tt. B) Tt and Tt. C) TT and TT. D) Tt and tt. Show Answer Correct Answer: B) Tt and Tt. 36. In a cross between pure tall with pure dwarf, then percentage of heterozygous in F2 is A) 75. B) 50. C) 12. D) 25. Show Answer Correct Answer: B) 50. 37. Some of the dominant traits studied by Mendel were A) Round seed shape, green seed colour and axial flower position. B) Terminal flower position, green pod colour and inflated pod shape. C) Violet flower colour, green pod colour and round seed shape. D) Wrinkled seed shape, yellow pod colour and axial flower position. Show Answer Correct Answer: C) Violet flower colour, green pod colour and round seed shape. 38. In mice, Y is the dominant allele for yellow fur and y is the recessive allele for grey fur. Since Y is lethal when homozygous, the result of cross Yy x Yy will be A) 2 yellow:1 grey. B) 3 Yellow:1 grey. C) 1 yellow:1 grey. D) 1 yellow:2 grey. Show Answer Correct Answer: A) 2 yellow:1 grey. 39. What is the probability of getting the gamete aB if the genotype is AaBB A) 100%. B) 75%. C) 50%. D) 25%. Show Answer Correct Answer: C) 50%. 40. The green controlling the seven pea characters studied by Mendel are now known to be located on how many different chromosomes? A) 7. B) 4. C) 6. D) 5. Show Answer Correct Answer: B) 4. 41. "When two pairs of traits are combined in a hybride, segregation of one pair of characters is independent of the other pair of characters" . The statement explains which of the following laws/principles of mendel? A) Principle of paired factors. B) Law of independent assortment. C) Principle of dominance. D) Law of segregation. Show Answer Correct Answer: B) Law of independent assortment. 42. In a cross between red flower and white flower plant, the F1 was pink. Which phenomenon is exhibited here? A) Incomplete dominance. B) Codominance. C) Multiple allelism. D) Pleiotropy. Show Answer Correct Answer: A) Incomplete dominance. 43. The inheritance pattern of a gene over generations among humans isstudied by the pedigree analysis. Character studied in the pedigreeanalysis is equivalent to: A) Quantitative trait. B) Maternal trait. C) Polygenic trait. D) Mendelian trait. Show Answer Correct Answer: D) Mendelian trait. 44. In multiple allele system a gamete possesses how many alleles A) 3. B) 4. C) 2. D) 1. Show Answer Correct Answer: D) 1. 45. Which of the following characters was not chosen by Mendel? A) Pod shape. B) Pod colour. C) Position of flower. D) Position of pod. Show Answer Correct Answer: D) Position of pod. 46. If a trait passes from father to all his daughters but none of his sons, the trait is A) Sex linked dominant. B) Autosomal recessive. C) Autosomal dominant. D) Sex linked recessive. Show Answer Correct Answer: A) Sex linked dominant. 47. ..... is the study of how traits are passed on, or inherited. A) Ratio. B) Dominant traits. C) Phenotype. D) Genetics. Show Answer Correct Answer: D) Genetics. 48. DIFFERENT alleles for the same trait. Sue has 1 gene for brown eyes and 1 gene for blue eyes so she is ..... A) Heterozygous. B) Homozygous. C) Dominant. D) Recessive. Show Answer Correct Answer: A) Heterozygous. 49. Given below are statements on Mendelian Monohybrid cross. Find the statement which is not correct. A) Contrasting traits appear in F2 generation in the ratio 3:1. B) Only the dominant trait expresses in the F2 generation. C) Reciprocal crosses produce same results. D) One of the contrasting trait remains unexpressed in F1 generation. Show Answer Correct Answer: B) Only the dominant trait expresses in the F2 generation. 50. Phenylketonuria is an inborn error of metabolism that is inherited as A) X-linked recessive trait. B) Autosomal dominant trait. C) Autosomal recessive trait. D) Sex-linked dominant trait. Show Answer Correct Answer: C) Autosomal recessive trait. 51. What proportion of the offsprings obtained from cross AABBCC X AaBbCc will be completely heterozygous for all the genes segregated independently? A) 1/4. B) 1/16. C) 1/2. D) 1/8. Show Answer Correct Answer: D) 1/8. 52. ABO blood grouping is controlled by gene I which has three alleles and show co-dominance. There are six genotypes. How many phenotypes in all are possible? A) Six. B) Three. C) Four. D) Five. Show Answer Correct Answer: C) Four. 53. Is the branch of biology dealing with the principles and mechanism of inheritance and variation. A) Heredity. B) Genetics. C) Variation. D) Inheritance. Show Answer Correct Answer: B) Genetics. 54. Marriage between persons having AB blood groups would produce: A) Offsprings with AB blood group only. B) Offsprings with A, B and AB blood groups. C) Offsprings with A and B blood groups only. D) Offsprings with A, B, AB and O blood groups. Show Answer Correct Answer: B) Offsprings with A, B and AB blood groups. ← PreviousRelated QuizzesScience QuizzesClass 12 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 1 Reproduction In Organisms Quiz 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books