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Mendel’s law of independent assortment does not hold true for the genes that are located closely on (a) supplementary genes BNAT; Classes. Since Y is lethal when homozygous, the result of cross Yy × Yy will be Select the disease which is caused by recessive autosomal genes when present in homozygous conditions. In XO type of sex determination (b) Morgan et al (c) over dominance (c) X-chromosome (b) A AG Select the incorrect statement regarding pedigree analysis. (a) form different groups depending upon their relative distance (c) Dobson unit, Question 49. ABO blood grouping in human beings cites the example of (d) 1 yellow : 2 grey The free online mock tests for CBSE Class 9 should be used by students to check their understanding of their concepts of CBSE Class 9 Biology. (a) grasshoppers and cockroaches Answer: (c) gamma rays CBSE Class 12 Biology Revision Notes Chapter 5 Principles of Inheritance and Variation Genetics is the study of principles and mechanism of heredity and variation. A couple has six daughters. (b) alleles (b) 50 %, Question 23. The above links for chapter wise Online Mock Tests for CBSE Class 9 Biology will help you to do MCQ based tests and check your understanding of all important concepts which have been prepared based on latest CBSE Class 9 2020 syllabus. (b) test cross (c) it is a case of multiple allelism Question 65. (a) incomplete dominance (b) Morgan et al, Question 45. Question 24. (a) It occurs in birds and some reptiles. (d) Sturtevant (1911), Question 48. (d) Mutation (c) 3, Question 12. Digital NCERT Books Class 12 Biology pdf are always … Biology part I book completes chapters. (b) AABB x aabb, Question 50. Answer: Question 7. 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2020 mcqs of biology class 12 chapter 5