单项选择题
A.全是灰种皮黄子叶 B.灰种皮黄子叶,灰种皮绿子叶,白种皮黄子叶,白种皮绿子叶 C.全是白种皮黄子叶 D.白种皮黄子叶、白种皮绿子叶
A.1/4 B.3/4 C.1/2 D.1/3
A.1/8 B.1/4 C.3/8 D.1/2