Chapter 3, Problem 27ESP

The wild-type (normal) fruit fly, Drosophila melanogaster, has straight wings and long bristles. Mutant strains have been isolated that have either curled wings or short bristles. The genes representing these two mutant traits are located on separate chromosomes. Carefully examine the data from the five crosses shown across the top of the next page.

1. (a) Identify each mutation as either dominant or recessive. In each case, indicate which crosses support your answer.
2. (b) Assign gene symbols and, for each cross, determine the genotypes of the parents.