In Drosophila the yellow (y) and the white (w) gene are both X-linked and recessive and 1m.u. apart. You cross a true breeding yellow female with white eyes with a male with wildtype body color and wildtype eyes. You obtain all wildtype females in the F1. You testcross an F1 female with a yellow bodied male with white eyes The expected proportion of the testcross males that are yellow with white eyes is 0.005 Answer 1: 0.005.