disjunction
(noun)The normal separation or moving apart of chromosomes toward opposite poles of the cell during cell division.Disjunction is another word for the normal segregation of homologous chromosomes or chromatids to opposite poles at meiotic or mitotic divisionsnondisjunction
(noun)Improper chromosome segregation, accidental chromosome missegregation at meiosis
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disjunction
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nondisjunction
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