Author: admin

33. Poplar is a dioecious plant. A wild plant with genes AABBCC was crossed with a triple recessive mutant aabbcc. The Fl male hybrid (AaBbCc) was then back crossed with […]

In Drosophila, Bar eye (B) is a dominant mutation whileminiature wing (m) and yellow body colour (y) arerecessive mutations. eterozygous females for thesemutations were crossed to normal eyed miniaturewinged and […]

31. A three point test cross was carried out in Drosophila melanogaster involving three adjacent genes X, Y and Z. arranged in the same order. The distance between X to […]

30. In Drosophila, balancer chromosomes are used to keep all the alleles on one chromosome together. A balancer contains multiple inversions; so that when it recombines with the corresponding wild […]

29. The additive nature of a genetic map as suggested by Alfred Sturtevant and T. H. Morgan is possible if there is: (1) no interference in crossovers. (2) complete interference […]

28. Ratio of observed double crossover frequency to the expected frequency of double crossover gamete during three point test cross is termed as- (1) Coefficient of interference (2) Coefficient of […]

27. The ratio of observed number of double crossover to expected number of cross over is termed as (1) Coefficient of coincidence (2) Coefficient of interference (3) Hitch hiking (4) […]

26. In an experiment involving mapping of 3 genes (a, b andc) in Drosophila, a three point test cross is carried out.The parental cross was AAbbCCXaaBBcc. The genotypesof the double […]

In a haploid organism, the loci A/a and D/d are 8 map units apart. In a cross Ad X aD, what will be the proportion of each of the following […]

A test cross was made with phenotypically wild type Drosophila files hiving genes for sepia eye and curled wing in heterozygous condition. The following results were obtained: Wild type 400 […]