红眼(R)雌果蝇和白眼(r)雄果蝇交配,Fl代全是红眼,自交得F2代,则F2代中( ) A.雌性果蝇全是红眼 B.雄性果蝇全是白眼 C.红眼与白眼的比例是1:1 D.红眼果蝇都是杂合子 答案:A据题意红眼是显性而且眼色的遗传是伴X遗传;所以父本是红眼时子代雌性果蝇全是红眼。----What is Tim doing?----He computer games, I’m not sure.A. might be playingB. might playC. could playD. couldn’t play