A Female Drosophila with Singed Bristles Is Crossed to a Male

Multiple Choice

A female Drosophila with singed bristles is crossed to a male with sepia (dark brown) eyes.In the F₁,all females are wild type,and all males have singed bristles.F₁ males and females are crossed together,and the following F₂ phenotypic ratios are obtained.

748 wild-type females
753 wild-type males
742 singed females
747 singed males
249 sepia females
250 sepia males
244 singed, sepia females
246 singed, sepia males

If sn and se represent the mutant alleles of the singed and sepia gene,respectively,and sn⁺ and se⁺ are their wild-type counterparts,what are the most likely genotypes of the original parents?

A) X/X;sn/sn;se⁺/se⁺ and X/Y;sn/sn⁺;se/se
B) X/X;sn/sn;se⁺/se and X/Y;sn/sn⁺;se/se
C) X^sn/X^sn+;se⁺/se⁺ and X^sn+/Y;se/se
D) X^sn/X^sn;se⁺/se⁺ and X^sn+/Y;se/se
E) X^sn/X^sn;se⁺/se and X^sn+/Y;se/se