A kidney-bean shaped eye is produced by a recessive gene, k, on the third chromosome of Drosophila. Orange eye color, called cardinal, is produced by the recessive gene cd on the same chromosome. A third recessive gene on chromosome three, e, produces ebony body color. Trihybrid females are testcrossed to produce 4000 progeny, as follows: 1761    kidney, cardinal 1773    ebony 128      cardinal 97        kidney 89        ebony, cardinal 6          kidney, ebony,cardinal 8          wild type 138      kidney, ebony   1.  Which gene is in the middle? 2.What is the distance between genes k and cd?

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