Dictionary of Human Evolution and Biology

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Half set; having the gametic number of chromatids, or half the number of somatic cells. Said of certain cells with a complete single set of a diploid genome or chromosome set. The human haploid complement consists of 23 chromatids out of a total pool of 24, the 23rd or 24th being either an X or a Y sex chromatid. Normally, only gametes are haploid in mammals.

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From "Dictionary of Nursing and Individual Health Care"