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.
超染色体交叉细胞核作为生物时间调节者的重要性即使不是一项新的发现，也是最近的发现。
The vital importance of the SCN as a biological time setter is a recent discovery, though not a new one.
针对运输中的“必经点”问题，设计了特殊染色体编码、交叉与变异规则；
For solving the problems of the necessity - node, the special rules of coding, crossover and mutation are designed.
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