The phenotype of vestigial short)wings vg in Drosophila melanogaster is caused by a recessive mutant gene that independently assorts with a recessive gene for hairy h)body.Assume that a cross is made between a fly with normal wings and a hairy body and a fly with vestigial wings and normal body hair.The wild- type F1 flies were crossed among each other to produce 1024 offspring.Which phenotypes would you expect among the 1024 offspring,and how many of each phenotype would you expect? A)Phenotypes: wild,vestigial,hairy,and vestigial hairy; Numbers expected: wild 576 ,vestigial 192),hairy 192),and vestigial hairy 64 . B)Phenotypes: wild,vestigial,hairy,and vestigial hairy; Numbers expected: wild 256 ,vestigial 256),hairy 256),and vestigial hairy 256 . C)Phenotypes: wild,vestigial,hairy,and vestigial hairy; Numbers expected: wild 192 ,vestigial 256),hairy 64),and vestigial hairy 192 . D)All vestigial hairy. E)All wild type.

Question

Quizplus · Accepted Answer

When crossing a fly with normal wings and hairy body (VgH) with a fly with vestigial wings and normal body hair (vgh), the F1 generation will all have normal wings and hairy bodies (VgHvg). When these F1 flies are crossed with each other, the resulting offspring will follow a 9:3:3:1 phenotypic ratio. This means that we would expect:

- 9/16 (576) to have normal wings and hairy bodies (VgHvg)
- 3/16 (192) to have vestigial wings and normal body hair (vgHvg)
- 3/16 (192) to have normal wings and no body hair (Vgh)
- 1/16 (64) to have vestigial wings and no body hair (vgh)

Therefore, the best choice is A.

The Phenotype of Vestigial Short)wings Vg in Drosophila Melanogaster Is