In drosophila, a cross was made between a yellow- bodied male with vestigial (not fully developed) wings and a wild-type female (brown body). the f1 generation consisted of wild-type males and wild-type females. f1 males and females were crossed, and the f2 progeny consisted of 16 yellow-bodied males with vestigial wings, 48 yellow-bodied males with normal wings, 15 males with brown bodies and vestigial wings, 49 wild-type males, 31 brown-bodied females with vestigial wings, and 97 wild-type females. explain the inheritance of the two genes in question based on these results.