In Fruit Flies, Brown Eyes Can Be Caused by the Recessive

Multiple Choice

In fruit flies, brown eyes can be caused by the recessive mutations pn (prune) , bw (brown) or ry (rosy) , which are on the X chromosome, second chromosome, and third chromosome, respectively.Wild-type alleles for all three genes must be present for eyes to be red.Suppose that two brown-eyed flies are crossed and their progeny consist of brown-eyed sons and red-eyed daughters.Which mutation is responsible for the brown eyes in the parental female?

A) pn
B) bw
C) ry
D) either bw or ry
E) any of the three - pn, bw, or ry