申論題

1. You keep stocks of flies of specific genotypes. You have a fly that has normal wings (dominant phenotypes). Flies with short wings are homozygous for a recessive allele of wing-length gene. You need to know if this fly with normal wings is pure-breeding or heterozygous for the wing-length trait. What cross would you do to determine the genotype, and what results would you expect for each possible genotype? (10 points)