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【单选题】
两个近交系杂交后获得的新的近交系,具备两个亲本近交系共同的特点,它的名字是
A.
近交系
B.
封闭群
C.
同源突变系
D.
重组近交系
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举一反三
【单选题】下列选项中哪个不是杂交亲本选配的原则（）
A.
亲本具有较多的优点，亲本间优缺点尽量得到互补
B.
亲本中有一个是能够适应当地条件的品种
C.
亲本间生态类型差异较大，亲缘关系较远
D.
亲本一般配合力较低
【单选题】In the 1920s demand for American farm products fell, as European countries began to recover from World War I and instituted austerity (紧缩) programs to reduce their imports. The result was a sharp drop...
A.
might cause greater scarcity of farm products
B.
didn't give the Secretary of Agriculture enough power
C.
would benefit neither the government nor the farmers
D.
benefited one group of citizens at the expense of others
【单选题】当F+×F-杂交是下列说法对的是( )
A.
F因子几乎总不转移到F+细胞中
B.
F- 菌株几乎总成为F+
C.
基因重组的发生频率较高
D.
F因子经常插入到F-细胞染色体上
相关题目：
【单选题】下列选项中哪个不是杂交亲本选配的原则（）
A.
亲本具有较多的优点，亲本间优缺点尽量得到互补
B.
亲本中有一个是能够适应当地条件的品种
C.
亲本间生态类型差异较大，亲缘关系较远
D.
亲本一般配合力较低
【单选题】In the 1920s demand for American farm products fell, as European countries began to recover from World War I and instituted austerity (紧缩) programs to reduce their imports. The result was a sharp drop...
A.
might cause greater scarcity of farm products
B.
didn't give the Secretary of Agriculture enough power
C.
would benefit neither the government nor the farmers
D.
benefited one group of citizens at the expense of others
【单选题】当F+×F-杂交是下列说法对的是( )
A.
F因子几乎总不转移到F+细胞中
B.
F- 菌株几乎总成为F+
C.
基因重组的发生频率较高
D.
F因子经常插入到F-细胞染色体上
参考解析：
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