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Continuity and Change D.4 Cell & Nuclear Division (id: 48bf87f36)

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admin 发表于 2024-2-6 11:31:06 | 显示全部楼层 |阅读模式
本题目来源于试卷: Continuity and Change D.4 Cell & Nuclear Division,类别为 IB生物学

[单选题]
Which row correctly states the num 5:)zxt5 svp pa7xbjacegra)( 2e)v 4vber of alle9fgg3 cj v9/avles of a single gene which would be presentfjg 3v9/ agvc9 in the nucleus of a cell as a result of each process?

A. Mitosis I is Two;Meiosis II is Two;Fertilisation is Two
B. Mitosis I is One;Meiosis II is One;Fertilisation is Two
C. Mitosis I is Two;Meiosis II is One;Fertilisation is Two
D. Mitosis I is Two;Meiosis II is One;Fertilisation is One


参考答案:  C


本题详细解析:

Choice C is correct because meiosis halves the number of chromosomes, mitosis maintains the diploid number and fertilisation restores the diploid number.

Choice A is incorrect because meiosis separates pairs of alleles and produces nuclei with one allele for each gene.

Choice B is incorrect because mitosis produces genetically identical cells that have two alleles for each gene.

Choice D is incorrect because, in fertilisation, two gametes fuse, and each gamete has one allele for each gene.

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