Dictionary of Human Evolution and Biology

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Either one of two distinct longitudinal subunits of a chromosome. The two identical sister chromatids share a common centromere and constitute a whole chromosome. Humans normally have the species-specific diploid number of 23 pairs of chromatids (2N 46) in nondividing somatic cells, and the haploid number of 23 unpaired chromatids (N 23) in mature sex cells or gametes. Aka unreplicated chromosome.

See mitosis and meiosis.

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From "Dictionary of Nursing and Individual Health Care"