posted by Amber .
In Drosophila, sepia colored eyes are due to a recessive allele s and wild type (red eye color) to its dominant allele s+. Sepia-eyed females are crossed to pure wild type males. What phenotypic and genotypic ratios are expected if the F1 males are then backcrossed to sepia-eyed parental females?
I'm assuming that eye color is sex-linked.
The P1 generation:
Male: X^s+, Y
Female: X^s, X^s
P1 generation cross: [X^s, X^s] x [X^s+, Y]
Cross of F1 males with P1 females:[X^s, X^s] x [X^s, Y]