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15问答网 > 为什么有丝分裂末期DNA和染色体含量都是从4N~2N？

为什么有丝分裂末期DNA和染色体含量都是从4N~2N？

2025-04-06 21:55:07

推荐回答（1个）

回答1：

因为细胞有丝分裂的末期，一个细胞分成两个子细胞，染色体数和DNA数都要恢复到原来的数目。

在有丝分裂的后期，由于着丝点断裂，所以染色体会由2N变成4N，而DNA含量由于间期的复制，此时还是4N，所以后期，染色体和DNA都是4N。

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