Problem:

Dominant mutation (Sb) in the Sb+ gene results in flies with stubble bristles.

A dominant mutation (Ser) in the Ser+ gene results in flies with serrated wings.

Stubble-bristled flies with normal wings are mated to flies with normal bristles, but serrated wings.

Both Sb+ and Ser+ loci are on the third chromosome.

Required:

Question: What would be the expected progeny and what would be their proportions (ratios)?

Question: Give phenotypes and phenotypic ratios with an explanation.

Any help would be greatly appreciated!