Question

In Drosophila, the eye color gene is on the X chromosome. The red eyes allele (W) is dominant over the white eyes allele (w). If a red-eyed homozygous female is crossed with a white-eyed male, what is the genotypic ratio of the F2 generation?

Answer 1

XWXw, XWXw, XWY, XWY

Step-by-step explanation:

Since this is a X linked allele, homozygous red eyed female will be
`X^(W)X^(W)` and white eyed male will be
`X^(w)Y`.

The offsprings will be
`X^(W)X^(w)`,
`X^(W)X^(w)`,
`X^(W)Y`,
`X^(W)Y`.

See the attached image for the Punnet's square analysis