You are performing a fruit fly cross similar to those that Morgan performed. Unfortunately, you forgot to write down the parents of your cross. You count the progeny, and find you have 40 red-eyed males, 80 red-eyed females, and 40 white-eyed males. Assuming that all genotypes from this cross should have equal survival rates, what are the genotypes of the parent flies?

Question

Quizplus · Accepted Answer

The progeny ratios suggest that the red-eyed trait is dominant and linked to the X chromosome. The presence of red-eyed females and both red and white-eyed males indicates that the mother was heterozygous (X^w+X^w) and the father had the dominant red-eyed allele (X^w+Y).

You Are Performing a Fruit Fly Cross Similar to Those