. When Thomas Hunt Morgan crossed his red-eyed F1 generation flies to each other, the F2 generation included both red- and white-eyed flies. Remarkably, all the white-eyed flies were male. What was the explanation for this result?
a. The involved gene was on the X chromosome.
b. The involved gene was on the Y chromosome.
c. The involved gene was on an autosome.
d. Other male-specific factors influence eye color in flies.
e. Other female-specific factors influence eye color in flies.