单项选择题
A.PPQq×PPQq B.PpQQ×Ppqq C.PpQq×ppqq D.PpQq×Ppqq
A.1/2或1/3 B.1/3或1/4 C.1/3或1/5 D.1/2或1/5
A.2种 B.3种 C.4种 D.8种