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【简答题】
目前解释杂种优势遗传的主要有 假说和 超显性 假说。它们的共同点在于:都立论于 同一对等位基因的相互作用 , 它们的不同点在于:前者认为杂种优势是 由于 杂种生活力来自于有利的显性基因 ;后者认为杂种优势是由于等位基因互作,杂合子比纯合子生活。
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皮皮学刷刷变学霸
举一反三
【单选题】Put these books ________ you can find them easily.
A.
when
B.
because
C.
where
D.
which
【简答题】汇总记账凭证账务处理程序的适用范围是（ ）。
【简答题】Put these books back immediately ____ they belong.
【单选题】They put these books ______ so the room looked neater than before.
A.
off
B.
in
C.
on
D.
away
【简答题】Put these books away on the shelf, please.(改为同义句) _____ _____ these books on the shelf, please.
【单选题】—May I put these books here, sir? —Yes, please. Just put____on the shelf. [ ]
A.
they
B.
them
C.
their
D.
theirs
【简答题】Put these books on the top of the others. ____
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【简答题】Put these books away on the shelf, please.(改为同义句) _____ _____ these books on the shelf, please.