In Drosophila, the recessive, sex-linked genes, abnormal eyes facet (fa) and singed bristles (sn) show 18 percent recombination.

a) If a singed male is crossed to a  female, what phenotypes are expected in the F1?

b) If the F₁ males and females are inbred, what phenotypic proportions would be expected to occur in F₂ males and females?

a) In the cross between a singed male (fa sn / Y) and a female (fa sn / fa sn), the F1 offspring would inherit one X chromosome from the mother and one X chromosome from the father. The males will inherit their X chromosome from their mother and the Y chromosome from their father. The females will inherit an X chromosome from both the mother and father.

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