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【单选题】

骡鸭是()和家鸭杂交的后代。A、半番鸭;

A.
番鸭;
B.
麻鸭
题目标签:番鸭杂交
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参考答案:
参考解析:
.
刷刷题刷刷变学霸
举一反三

【单选题】当F+×F-杂交时:( )

A.
F因子几乎总不转移到F+细胞中
B.
F-菌株几乎总是成为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

【单选题】Southern杂交通常是指()。

A.
DNA和RNA杂交
B.
DNA和DNA杂交
C.
RNA和RNA杂交
D.
蛋白质和蛋白质杂交
E.
DNA和蛋白质杂交

【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

【单选题】番鸭细小病毒病又称()

A.
大头瘟
B.
摇头瘟
C.
背脖病
D.
三周病