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 FI flies have normal legs, hairy wings, and normal eyes. What phenotype will you choose for your test cross fly?

Solution

To analyse the heterozygotes in drosophila test crossing heterozygous females with triple recessive tester males.

As F1 flies are all normal, while their parents are triple recessive females and wild-type males.

The phenotype for test cross would be between F1 normal males vs triple recessive females