This stem cell which is reproduced still has the potential to undergo asymmetric division but this one does not.

新生成的干细胞,仍然有潜能进行不对称分裂,但定向祖细胞就不行

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No. All we can say is, there was an 80 percent chance it would, 20 percent chance it wouldn't, so most of them do, some of them don't.

不能,我们只能说,这个原子分裂的概率是百分之八十,不分裂的概率是百分之二十,它们当中的大部分会分裂,而一部分不会

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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

耶鲁公开课 - 生物医学工程探索课程节选