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【单选题】
下列情况不属于染色体变异的是 [ ]A.
人的第5号染色体部分缺失引起的猫叫综合征
B.
人的第21号染色体多一条引起的先天智力障碍
C.
非同源染色体上的非等位基因之间自由组合
D.
采用花粉(花药)离体培养的方法获得单倍体植株
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反馈参考答案：
举一反三
【单选题】A brick works, together with some drug factories, ______ here.
A.
is to build
B.
is to be built
C.
are to build
D.
are to be built
【单选题】El Nino While some forecasting methods had limited success predicting the 1997 El Nino a few months in advance, the Columbia University researchers say their method call predict large El Nino events u...
A.
Right
B.
Wrong
C.
Not mentioned
【简答题】2 Rob is allowed to take five things and some ______ to listen to.
【简答题】I/O 与主机信息传送的控制方式有 _____、_____和DMA方式。
【单选题】El Nino While some forecasting methods had limited success predicting the 1997 El Nino a few months in advance, the Columbia University researchers say their method can predict large El Sino events up...
A.
Right
B.
Wrong
C.
Not mentioned
【单选题】Many factories and banks in some countries have closed down as a direct ________ of the financial crisis going on in the USA. [ ] A. matter
B.
consequence
C.
whole
D.
total
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