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  1. Oxford American Dictionary

    nondisjunction

    • IPA[ˌnändisˈjəNG(k)SH(ə)n]

    美式

    • n.
      the failure of one or more pairs of homologous chromosomes or sister chromatids to separate normally during nuclear division, usually resulting in an abnormal distribution of chromosomes in the daughter nuclei.

    • noun: non-disjunction