Suppose That You Examine a Vial of 100 Flies That

Multiple Choice

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?

A) X^w+X^w; X^w+Y
B) X^wX^w; X^w+Y
C) X^w+X^w; X^wY
D) X^w+X^w+; X^w+Y