Tag: CSIR NET Life Science Previous Year Questions and Solution Genetics

19. In an organism, allele governs grey body colour,while its mutant allele a gives yellow body colour.Further, presence of allele gives long and thin hairswhile b allele gives rise to […]

18. Assume that the genes w+ and cv+ are located 20 CM apart on the X chromosome of Drosophila melanogaster. Mutations in w+and cv+ give rise to white eyes and […]

17. Two mutations were isolated in bacteriophage, one causing clear plaque (c) and the other causing minute plaque (m). The genes responsible for these two mutations are 9 CM apart. […]

16. Two genes a and b are located at a distance of 10 cM. Individuals of the genotype AaBb are sib-mated. The two genes are linked in trans. What percentage […]

15. Genetic mapping reveals that distance between two genes ‘A’ and ‘B’ is 10 cM. What is chance of getting Aabb progeny if AaBb is test crossed? (1) 5 &           […]

14. A plant with genotype r+h+/ r– h– was test crossed. Out of total 280 progeny 260 are r+h+/ r–h– and r–h–/r–h–. The recombination frequency will be (1) 92.8       (2) […]

13. The distance between gene A and B is 10 cM. If a genotype    A    b     is selfed, the a    B percentage of progeny with genotype aabb will be (1) […]

12. Distance between the two linked genes A and B is 20 cM. On test cross of    A    b a    B with recessive parent how many offspring will have genotype    […]

11. Distance between gene A and B is 10 cM. If the F1 genotype  A     B    was test a      b crossed then what is probability of obtaining A      B    genotype […]

10. After meiosis the 20 % gametes are recombinant for two genes. The distance between two genes will be (1) 5 Cm                 (2) 10 cM (3) 20 cM      […]