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。
At this point esch chromosome consist of a pair of chromatids and the two associated chromosomes are termed a tetrad.
双线期时，配对的染色单体开始从四分体中分离，此时常可见染色体交叉。
In diplotene the pairs of chromatids begin to separate from the tetrad formed by the association of homologous chromosomes.
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