Fruit flies homozygous for wild-type body (B) and wild-type wings (V) were crossed with homozygous recessive black bodies (b) and vestigial-winged flies (v). The F1 offspring were then test-crossed with flies homozygous recessive for both body color and wing.
The following results were obtained in the F2 generation:
|Wild-type body and wild-type wings||350|
|Wild-type body and vestigial wings||30|
|Black body and wild-type wings||45|
|Black body and vestigial wings||275|
Based on these results, which of the following is the BEST conclusion?