Replication of DNA occurs in interphase;by the end of interphase the replicated DNA and associated histones are in the form of chromosomes each consisting of two chromatids joined at the centromere.

• DNA的复制发生在分裂期间，在分裂间期末，复制形成的DNA和组蛋白结合在一起形成染色体，每个染色体包含两个在着丝点联结的染色单体。