Dictionary of Human Evolution and Biology

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Sister Chromatids

Chromosome; identical chromatids attached by a centromere after S-phase DNA replication. Attached sister chromatids exist only during the early phases of cell division, the object of which is the normal disjunction and segregation of the condensed chromatids into the daughter cells. Although genetically identical, one chromatid is not exactly a copy of its sister, owing to semiconservative replication of DNA.

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