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Nondisjunction, Genetic
Genetic Non-Disjunction; Genetic Nondisjunction; Non-Disjunction, Genetic; Genetic Non Disjunction; Genetic Non-Disjunctions; Genetic Nondisjunctions; Non Disjunction, Genetic; Non-Disjunctions, Genetic; Nondisjunctions, Genetic
The failure of homologous CHROMOSOMES or CHROMATIDS to segregate during MITOSIS or MEIOSIS with the result that one daughter cell has both of a pair of parental chromosomes or chromatids and the other has none.