Question

1. Show how breeding females of the vermilion/brown, cinnabar/brown, and scarlet/brown double mutants with males of the scarlet strain (instead of the cinnabar strain) would also have enabled us to differentiate between the three double mutant Drosophila strains. Include the genotypes of the breeding partners and the offspring, and the phenotypes of the offspring.

Answer 1

Answer

• 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.

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