Meiosis in which there is a failure of paired homologous chromosomes to separate

• Results in an abnormal number of chromosomes in the daughter cells

Wikipedia Word definitions in Wikipedia
Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate properly during cell division . There are three forms of nondisjunction: failure of a pair of homologous chromosomes to separate in meiosis I , failure of sister chromatids ...

Wiktionary Word definitions in Wiktionary
n. (context genetics English) The failure of chromosome pairs to separate properly during meiosis

WordNet Word definitions in WordNet
n. meiosis in which there is a failure of paired homologous chromosomes to separate; results in an abnormal number of chromosomes in the daughter cells