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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. Xsn/Xsn+; se+/se+ and Xsn+/Y; se/se D. Xsn/Xsn; se+/se+ and Xsn+/Y; se/se E. Xsn/Xsn; se+/se and Xsn+/Y; se/se

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