A heterozygous,but phenotypically wild-type fruit fly (gray body color and normal wings)was mated to a black fly with vestigial wings.The offspring had the following phenotypic distribution:
Wild type,720;black-vestigial,780;black-normal,280;gray-vestigial,220.What conclusion is likely from these results?

Question

Quizplus · Accepted Answer

The presence of non-parental phenotypic classes (black-normal and gray-vestigial) and their relatively low frequency suggests that the black and vestigial loci are physically linked on the same chromosome. This linkage causes these alleles to be inherited together more frequently but not in complete linkage as some recombination occurs, leading to the production of the non-parental phenotypes. Therefore, option D is the most likely conclusion.

A Heterozygous,but Phenotypically Wild-Type Fruit Fly (Gray Body Color and Normal