- the failure of chromosomes to separate and segregate into daughter cells at division.
Origin of nondisjunction
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Examples from the Web for non-disjunction
Non-disjunction as proof of the chromosome theory of heredity.Sex-linked Inheritance in Drosophila
Thomas Hunt Morgan
- the failure of paired homologous chromosomes to move to opposite poles of the cell during meiosis
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for non-disjunction
Online Etymology Dictionary, © 2010 Douglas Harper
- The failure of one or more pairs of chromosomes to separate at the miotic stage of karyokinesis, with the result that both chromosomes are carried to one daughter cell and none to the other.
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