题目内容

所谓质-核不育是由质-核中相应基因的互作而引起的，水稻杂种优势利用中成功地利用了这种雄性不育，以下哪种基因型能作为保持系( )。

A. S(Rr)
B. N(rr)
C. S(rr)
D. N(Rr)

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染色体重复可带来基因的（）。

A. 剂量效应
B. 互作效应
C. 突变
D. 重组

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一个句型中称为句柄的是该句型的最左（）

A. 非终结符号
B. 短语
C. 句子
D. 直接短语

对应Chomsky四种文法的四种语言之间的关系是（）。

A. L0ÌL1ÌL2ÌL3
B. L3ÌL2ÌL1ÌL0
C. L3=L2ÌL1ÌL0
D. L0ÌL1ÌL2=L3