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

E coli cells were simultaneously infected with two strains of phage λ, One strain of λ had a mutant host range, is temperature sensitive and known to produce clear plaques […]

When F1 female Drosophila of he genotype a+a b+ b c+ c is test crossed, the following progenies were obtained: Progeny classes No. of progenies a+ b+ c+ 22 a+ […]

The genetic map of three genes in Drosophila melanogaster is given below: cu e                  se 20 cM12 cM A cross as given below individuals of the genotype: a+    b+    c             […]

Curled wing (cu), ebony body colour (e) and sepia eye (se) are three recessive mutations that occur in fruit flies. The loci for these mutations have been mapped and they […]

35. In Drosophila order of genes under investigation is as shown in figure. b+          cm+               w+ 5cM           10cM if drosophila with genotype    b+    cm+    w+ b       cm     w is test […]

34. In D. Melanogaster, traits ‘b’ and ‘c’ result from recessive alleles that are located on one of the autosomes. The resulting Fl females were test crossed and the following […]

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 […]