nondisjunction

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non·dis·junc·tion

 (nŏn′dĭs-jŭngk′shən)
n.
The failure of paired chromosomes or sister chromatids to separate and go to different cells during meiosis.

non′dis·junc′tion·al adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

nondisjunction

(ˌnɒndɪsˈdʒʌŋkʃən)
n
(Genetics) the failure of paired homologous chromosomes to move to opposite poles of the cell during meiosis
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.nondisjunction - meiosis in which there is a failure of paired homologous chromosomes to separate; results in an abnormal number of chromosomes in the daughter cells
meiosis, miosis, reduction division - (genetics) cell division that produces reproductive cells in sexually reproducing organisms; the nucleus divides into four nuclei each containing half the chromosome number (leading to gametes in animals and spores in plants)
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References in periodicals archive ?
Of all our genetic nondisjunctions (with the possible exception of hermaphroditism), only Down syndrome produces so nuanced, so finely articulated a variation on "normal" reproduction.