题目内容

番茄中红果(R)对黄果(r)显性,现将红果花粉授到黄果植株的柱头上,所结番茄果皮的颜色是(  

A.红黄之比为3:1           

B.全为黄色   

C.全为红色            

D.红黄之比为1:1

 

 

答案:B
解析:

因为番茄果皮是体细胞,其颜色与母本的颜色相同。

 


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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

 

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