Medical Dictionary

nondisjunction

noun non·dis·junc·tion \ˌnän-dis-ˈjəŋ(k)-shən\

Medical Definition of NONDISJUNCTION

:  failure of homologous chromosomes or sister chromatids to separate subsequent to metaphase in meiosis or mitosis so that one daughter cell has both and the other neither of the chromosomes
non·dis·junc·tion·al \-shnəl, -shən-əl\ adjective

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