题目
I don’t think should be allowed to drive. A.sixteen-year-old B.sixteen-years-old C.sixteen-years-olds D.sixteen-year-olds 答案:D2、番茄中红果(R)对黄果(r)显性。现将A、B、C、D、E、F、G 7种番茄杂交,结果如下表所示。在作为亲本的7种番茄中,有几种是纯合子?
F1植株数
杂交组合
红果株数
黄果株数
总株数
A×B
24
8
32
C×D
0
28
28
E×F
16
16
32
G×D
40
0
40
A.2
B.3
C.4
D.5