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srmtrc srmtrc
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Posts: 33
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9 years ago
In Drosophila, the X-linked recessive mutation vermilion (v) causes bright red eyes, in contrast to the brick-red eyes of wild type.

A separate autosomal recessive mutation, suppressor of vermilion (su-v), causes flies homozygous or hemizygous for v to have wild-type eyes.

In the absence of vermilion alleles, su-v has no effect on eye color.

You then cross two of the F1 flies to obtain the F2 genotypes listed below. Determine the proportion of each genotype class and their phenotypes. (see picture)

What phenotypic ratio do you see in the F2?
_____ wild-type females : _____ wild-type males : _____ vermilion females : _____ vermilion males
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