Normal fruit flies have red eyes.Flies with mutations that block the function of the X-linked white gene have white eyes.The wild-type allele is completely dominant to mutant alleles.A white-eyed female fruit fly is mated to a red-eyed male.One of their hundreds of female progeny is white-eyed.This white-eyed daughter likely arose from nondisjunction of the sex chromosomes during ________ in the ________.
A)meiosis I; mother
B)meiosis II; mother
C)meiosis I; father
D)meiosis II; father
E)meiosis I or II; mother

Question

Quizplus · Accepted Answer

The white-eyed daughter likely resulted from nondisjunction of the sex chromosomes during either meiosis I or II in the mother. This is because the mother, being white-eyed and thus having the mutant allele on her X chromosome, could pass on an abnormal X chromosome due to nondisjunction, leading to a white-eyed female progeny if the progeny also inherits an X chromosome from the father.

Normal Fruit Flies Have Red Eyes