Chapter 5, Problem 23P

In Drosophila, the recessive allele mb of one gene causes missing bristles, the recessive allele e of a second gene causes ebony body color, and the recessive allele k of a third gene causes kidney-shaped eyes. (Dominant wild-type alleles of all three genes are indicated with a + superscript.) The three different P generation crosses in the table that follows were conducted, and then the resultant F females from each cross were testcrossed to males that were homozygous for the recessive alleles of both genes in question. The phenotypes of the testcross offspring are tabulated. Determine the best genetic map explaining all the data.