In Drosophila melanogaster there is a sex-linked gene for eye color that is found only on the X
chromosome. The allele for red eye color (Xw+) is dominant over the allele for white eye color (Xw).
You examine a vial of 100 flies that are all offspring from a single genetic cross. You find only redeyed
females and red-eyed males present. Flies from the vial were allowed to interbreed, and in the
next generation you find only red-eyed females, but you find both red-eyed and white-eyed males. The
genotypes of the original parents were
a. Xw+Xw+; XwY.
b. Xw+Xw; XwY.
c. XwXw; Xw+Y.
d. Xw+Xw; Xw+Y.
e. XwXw; XwY.
A
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