The diagram shows the results of two different genetic crosses of Drosophila melanogaster (fruit flies).
Which is a possible explanation of the results of these crosses?
Gray is dominant. Fly 1 is homozygous dominant.
Ebony is dominant. Fly 2 is homozygous dominant.
Ebony is dominant. Fly 2 is heterozygous.
Gray is dominant. Fly 2 is heterozygous.