The rosy (ry) gene of Drosophila encodes an enzymecalled xanthine dehydrogenase. Flies homozygous forry mutations exhibit a rosy eye color. Heterozygousfemales were made that had ry41 Sb on one homologand Ly ry564 on the other homolog, where ry41 andry564 are two independently isolated alleles of ry. Ly[Lyra (narrow) wings] and Sb [Stubble (short) bristles] are dominant mutant alleles of genes to the left and right of ry, respectively. These females arenow mated to males homozygous for ry41. Out of100,000 progeny, 8 have wild-type eyes, Lyra wings, andStubble bristles, while the remainder have rosy eyes.a. What is the order of these two ry mutations relativeto the flanking genes Ly and Sb?

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