以下为句子列表：
英文: Alternatively, like allopolyploids, they may arise by the nondisjunction of chromatids during the mitotic division of a zygote.
中文: 与异源多倍体相似的是，它们也是在有丝分裂中合子的染色单体不分离形成的。
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英文: Anaphase The stage in mitosis or meiosis when chromatids are pulled toward opposite poles of the nuclear spindle.
中文: 后期:在有丝分裂或者减数分裂过程中染色单体分别朝相反的两极运动。
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英文: At this point esch chromosome consist of a pair of chromatids and the two associated chromosomes are termed a tetrad.
中文: 此时每条染色体由一对染色单体构成，这两条联合的染色体称为四分体。
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英文: Crossing over The exchange of material between homologous chromatids by the formation of chiasmata.
中文: 交换：同源染色单体之间形成交叉时遗传物质的交换现象。
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英文: But during the transition from metaphase to anaphase, APC is activated and it discomposes the securin. Then the separse what is a protease has activity and it discompose cohesin. So the sister chromatids separate.
中文: 通常情况下分离酶受到保全素(securin/PTTG)的抑制而没有活性,当细胞从有丝分裂中期向后期转变时,APC(anaphase-promoting complex, 后期促进复合体)被激活并裂解保全素,具有蛋白酶活性的分离酶裂解粘合姐妹染色单体的粘合素(cohesin),姐妹染色单体分离。
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