| disjunction | The normal separation of pairs of chromosomes at the anaphase stage of meiosis I or II. Origin: dis-+ L. Junctio, a joining, fr. Jungo, pp. Junctum, to join (05 Mar 2000) |
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| disjunction mutant | Drosophila mutant in which chromosomes are partitioned unequally between daughter cells at meiosis, as a result of nondisjunction. (18 Nov 1997) |