统考科学_下册第2章

统考科学_下册第2章

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4th Grade

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1 Slide • 4 Questions

1

统考科学_下册第2章

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2

Multiple Choice

1. 显微镜观察发现，某人的细胞中只有23条染色体，可以肯定这是

1

癌细胞

2

红细胞

3

白细胞

4

生殖细胞

3

Multiple Choice

2. 陈先生与陈太太生了5个女儿，他们体细胞中的两条X 染色体一定

1

分别来自父亲和母亲

2

由女儿体细胞中的一条X染色体复制而来

4

Multiple Choice

3. 关于DNA 的叙述，不正确的是

1

相对分子质量很大

2

分子形成双螺旋状

3

基因是DNA分子上起遗传作用的片段

4

每个DNA分子上只有一个基因

5

Multiple Choice

4.基因突变是

1

染色体上某个位点发生改变

2

新的突变基因取代了原有的基因

3

DNA上的一些位点发生改变

4

基因控制的性状发生改变

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统考科学_下册第2章

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