In Drosophila melanogaster,vestigial (short)wings (vg)are caused by a recessive allele of a gene that independently assorts with a gene pair that influences body hair.Hairy (h)results in a hairy body.A cross is made between a fly with normal wings and a hairy body and a fly with vestigial wings and a normal body.The phenotypically normal F₁ flies were crossed among each other,and 1024 F₂ flies were reared.What phenotypes would you expect in the F₂,and in what actual numbers (not ratios)would you expect to find them?

Question

Quizplus · Accepted Answer

The F1 flies are heterozygous for both traits (vg+ vg, h+ h). In the F2 generation, the expected phenotypic ratio for two independently assorting genes is 9:3:3:1. Therefore, out of 1024 flies, you would expect approximately 576 wild, 192 vestigial, 192 hairy, and 64 vestigial hairy.

In Drosophila Melanogaster,vestigial (Short)wings (Vg)are Caused by a Recessive Allele