(3) 3SO2+2+3Ba2++2H2O=3BaSO4 ↓+2NO↑+4H+;SO2

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通电

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31.(18分)自然界中玉米的绿色茎为稳定遗传,但在田间偶尔也会有紫色茎的玉米出现。

(1)请用绿茎玉米和紫茎玉米为材料,设计一个方案判断这一性状是否由质基因控制的,写出实验方案。

①实验方案:                                                                                                                                                                                                                                                                                                                                                                                         

②预测结果并得出相应结论:                                                                                                                                                                                                                                                                                                                                                                 

(2)若已证实这对性状为核基因A和a控制,选用绿茎纯合子玉米与紫茎玉米杂交,证明这对性状的显隐性关系:

①若子代表现型为                     ,则绿为显性;此株紫色玉米的基因型为                    

②若子代表现型全为紫色,则绿为           性,此株紫色玉米的基因型为                        

③若子代既有绿茎又有紫茎,则紫色为           性,此株紫色玉米的基因型为                                                           

 

 

 

 

2009年高考理科综合模拟试卷(一)

生物部分

参 考 答 案

 

班级:_____姓名:_______                   分数:______

 

题号

1

2

3

4

5

答案

C

B

C

B

B

 

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