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. Other male-specific factors influence eye color in flies.
b. The gene involved is on the Y chromosome.
c. The gene involved is on the X chromosome.
d. The gene involved is on an autosome, but only in males.
Answer: c. The gene involved is on the X chromosome.
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