In diplotene the pairs of chromatids begin to separate from the tetrad formed by the association of homologous chromosomes.
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。
2
During diakinesis the sister chromatids of homologous pairs of chromosomes complete their separation and the chromosomes coil tightly shortening and thickening.