A white-eyed female fruit fly is mated to a red-eyed male.One of their progeny is a white-eyed female.What is the likely karyotype of this white-eyed daughter?

Question

Quizplus · Accepted Answer

The white-eyed trait in fruit flies is X-linked recessive. For a female to be white-eyed, she must inherit two recessive alleles. The presence of a white-eyed female progeny from a red-eyed male suggests a nondisjunction event, leading to an XXY karyotype where the extra X carries the recessive allele.

A White-Eyed Female Fruit Fly Is Mated to a Red-Eyed