豌豆子叶的黄色(Y),圆粒种子(R)均为显性。两亲本豌豆杂交的F

豌豆子叶的黄色(Y),圆粒种子(R)均为显性。两亲本豌豆杂交的F1表现型如下图。让F1中黄色圆粒豌豆与绿色皱粒豌豆杂交,F2的性状分离比为

A.9:3:3:1              B.3:1:3:1

C.1:1:1:1              D.2:2:1:1

答案

D

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