In some experiments I have been performing upon the inheritance of eye color in Drosophila, I have identified a new autosomal recessive mutation which results in the eye color being very dark, rather than the red color of normal wild-type eyes. I named this gene claret (symbol: ca).

The X-linked white mutation, when homozygous or hemizygous for the mutant allele, shows epistasis with claret, such that homozygotes for the recessive white-eye mutation cannot be assessed for their phenotype with respect to claret. What would be the expected phenotypic ratios in the F1 and F2 of a cross of a pure-breeding claret female (wild-type at the white locus) to a pure-breeding white-eyed male (wild-type at the claret locus) ?