Author: admin

23. Which statement is true for Drosophila melanogaster? (1) female are achiasmatic (2) recombination does not occur during male meiosis (3) recombination does not during female meiosis (4) males show […]

A cross was made between pure wild type males and brown eyed curled winged females of D. melanogaster. The F1 females were test crossed. The F2 progeny obtained was as […]

21. In a linkage map, two genes A and B, are 70 CM apart. If individuals heterozygous for both the genes are test crossed number of progeny with parental phenotype […]

20. The maximum frequency of recombination that can occur between two loci is (1) 25%         (2) 50% (3) 75%         (4) 100% The maximum frequency of recombination that can occur between […]

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) […]