Suppose that you examine a vial of 100 flies that are all offspring from a single genetic cross. Also suppose that the only females you see present are red-eyed, but the males you see present are both red-eyed and white-eyed. The allele for red eye colour (X^w+) is dominant over the allele for white eye colour (X^w). Which of the following describes the genotypes of the parents?

Question

Quizplus · Accepted Answer

The female parent must be heterozygous (X^w+X^w) to produce both red-eyed and white-eyed males, while the male parent must be red-eyed (X^w+Y) to ensure all females are red-eyed.

Suppose That You Examine a Vial of 100 Flies That