1. How can helper T cells stimulate both humoral and cell-mediated immunity? (8 分)

6. To study the inheritance of the white-eye trait in Drosophila melanogaster, Morgan crossed the white-eyed male to a red-eyed female and found that all of the F1 offspring had red eyes. The F1 offspring were then mated to each other, which generated 2,459 red-eyed females, 1,011 red-eyed males, and 782 white-eyed males. (1) How will you interpret these experimental data? (4 分)