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 flies would indicate that the wild-type fruit fly was heterozygous?.
