13) A fruit fly can have normal wings (wild type) or vestigial wings (mutant). The vestigial phenotype is the result of a recessive condition. A researcher has a fruit fly with wild-type wings
and a fruit fly with vestigial wings. However, the researcher is unclear about the genotype of the wild-type fruit fly. If the two flies are test crossed, which results in progeny files would
indicate that the wild-type fruit fly was heterozygous?
A) 14 wild-type flies, 15 vestigial-winged flies
B) 28 wild-type flies and 1 mutant with a new phenotype
29 wild-type fies
D) 29 vestigial-winged flies