37. 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 gene involved is on the Y chromosome. (B) The gene involved is on the X chromosome. (C) The gene involved is on an autosome, and only in males. (D) There are other male-specific factors that may influence eye color in flies.