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

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?

A) The black and vestigial loci assort independently from each other.
B) The black and vestigial loci are allelic.
C) Epistasis has modified a 9:3:3:1 ratio.
D) The black and vestigial loci are linked.

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