In Drosophila a recessive mutation called chocolate c causes

In Drosophila, a recessive mutation called chocolate (c) causes the eyes to be darkly pigmented. The mutant phenotype is indistinguishable from that of an autosomal recessive mutation called brown (bw). A cross of chocolate-eyed females to homozygous brown males yielded wild-type females and darkly pigmented males. If the flies are intercrossed, what types of progeny are expected, and in what proportions? (Assume the double mutant combination has the same phenotype as either of the single mutants alone.)

SHOW ALL WORK

Solution

DROSOPHILA: Drosophila is a genus of small flies, belonging to the family Drosophilidae, They are also called as fruit flies.

Given,

In Drosophila, a recessive mutation called choclate (c) causes the eyes to be darkly pigmented.The mutant phenotype is indistinguishable from that of an autosomal recessive mutation called brown (bw).

A cross of chocolate-eyed females to homozygous brown males yielded wild-type F1 females and darkly pigmented F1 males. If the flies are intercrossed, The expected progeny are:

3/8 wild-type (red), and

5/8 brown for both male and female F₂ progeny.