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Biology, 27.02.2020 19:17 janel72

The following crosses in Drosophila involve the X-linked recessive eye mutation white and the autosomally linked recessive eye mutation sepia (resulting in a dark eye). Recall that white acts epistatically to the expression of sepia, as the white locus controls the transport of pigment into the eye. Predict the F1 and F2 results of crossing true-breeding parents of the following genotypes and phenotypes. Cross 1: w/w; se+/se+ (white) females x w+/Y; se/se (sepia) malesIn the F1, female eyes are and male eyes are .F1 males and females are crossed to generate the F2.In the F2, the ratio of eye colors in the progeny is the same in males as it is in females. In the F2, the proportion of females with sepia eyes is .Cross 2: w+/w+; se/se (sepia) females x w/Y; se+/se+ (white) malesIn the F1, female eyes are and male eyes are .F1 males and females are crossed to generate the F2.In the F2, the ratio of eye colors in the progeny is the same in males as it is in females. In the F2, the proportion of females with sepia eyes is .

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