In Fruit Flies, Males Are Determined by the Presence of an X

Multiple Choice

In fruit flies, males are determined by the presence of an X and Y chromosome; females are determined by two X chromosomes. The gene for eye color is located on the X chromosome and is absent from the Y chromosome. The allele for white eyes is recessive and the allele for red eyes is dominant. If a red-eyed male is mated with a white-eyed female, what is the probability that their male offspring will be white-eyed?

A) 100%
B) 50%
C) 25%
D) 0%