Question

Show how the breeding of vermilion/brown, cinnabar/brown, and scarlet/brown double mutant female Drosophila with single mutant scarlet male Drosophila would enable differentiation between the 3 double mutant strains. Show genotypes and phenotypes.

Answer 1

Generally, normal (wild type) of drosophila eye color is red but, in the case provided for study shows that vermillion/brown-the eye color is more like orange, cinnabar/brown the double mutant female drosophila eye color is white and scarlet/brown double mutant drosophila exhibits white color eyes.

The ABC or traffic transpoters superfamily is large and growing group of active transports in eukaryotes and prokaryotes.It is been postulated that pigment precurssors are tranported into pigment cells by menmbrane transported known as ABC tranporters and are encoded with white (w), scarlet (st) and brown (bw) genes of Drosophila sps. The phenotype of the test cross progeny resembles either with parental normal features (double mutant) or with mutant features (single mutant). In the progency obtained, three phenotypes are been controlled by three different mutant phenotypes and hence it provides us an information that same gene is responsible and controlling all the three double mutant characters. Mutations in these kinds of genes results in altered phenotypes of its eye color.