試題詳解

34. When Thomas Hunt Morgan crossed his red-eyed Fi generation flies to each other, the F2 generation included both red- and white-eyed flies. Remarkably, all the white-eyed flies were male. He concluded that the involved gene was on the X chromosome. Why he could make this conclusion?
(A) Before this experiment, he already knew the genes are located at chromosome.
(B) Before this experiment, he knew that the sex was determined by X and Y chromosome.
(C) He knew the phenotype of eyes was sex-Iinkage.
(D) His conclusion makes non-sense at all.
(E) Before this experiment, he knew that Y-chromosome canys very few genes.