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We talked about mitosis last time; it's described more completely in the chapter, where two cells are formed from one.
我们上节课说到过有丝分裂,在那一章里更详细的阐释了,细胞是怎么由一生二的
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That's shown schematically here, let me talk about the bottom diagram first, which shows the process of mitosis.
在此我们图解了这一过程,我先从下面图表里的,有丝分裂过程讲起
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Mitosis is an orderly sequence of events by which one parent cell becomes two daughter cells.
有丝分裂是指一个亲代细胞,变为两个子细胞的有序的过程
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Mitosis is one event that happens during this larger event called the cell cycle.
有丝分裂就是发生在,较大的细胞周期中的一个小一点的环节
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It's time for you to reproduce', and so the cellular response would be mitosis.
该是复制的时候了",细胞就开始进行有丝分裂
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When I talked about mitosis, I talked about cells making perfect copies of each other, so each parent cell becoming two daughter cells that are the same.
我讲有丝分裂的时候,谈到过细胞能够完美的复制自己,母细胞分裂成为,两个完全一样的子细胞
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The size of the cells could be different; maybe mitosis is asymmetrical in some way so that one of the cells ends up being bigger than the other.
细胞大小可能会不同,也许有丝分裂的过程是不对称的,致使子细胞一个大一个小
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They're not chromosomal differences because this is the ordinary process of mitosis.
它们的染色体没有任何变化,因为这是正常的有丝分裂过程
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That's one of the properties of mitosis, that the DNA gets completely duplicated during the S phase, during DNA synthesis phase.
有丝分裂的一个特征,就是DNA在S期内完全复制,S期就是DNA合成期
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If mitosis occurs the way that it's supposed to, the DNA that's in each of these cells is the same.
如果有丝分裂的过程按部就班地进行,那所有细胞的DNA都是相同的
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Several things happen during mitosis, first, when a cell enters the process of mitosis it already has twice the DNA that it needs.
有丝分裂中有几个重要的步骤,首先,当细胞进入有丝分裂过程,细胞中已含有两倍于其正常所需的DNA
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If I followed one of them it is in a phase that's called G1 first and this is a resting phase before it enters the process of synthesizing new DNA in preparation for another round of mitosis.
如果我们跟随一个细胞前进,首先进入G1期,这是一段静息期,之后进入,合成新DNA的S期,为下一轮有丝分裂做准备
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