You are using a threepoint cross to map three Drosophila mut

You are using a three-point cross to map three Drosophila mutations (long legs, hairy ___/2 wings, and small eyes). You cross a pure breeding triple mutant female to a wild-type male, and observe that all F1 flies have normal legs, hairy wings, and normal eyes. What phenotype will you choose for your test cross fly?

Solution

To test cross the f1 fly, we need to choose the fly with all mutant characters which are long legs, normal wings, small eyes. Becasue the F1 shows only dominant characters, so here hairy wings mutation is a dominant one.