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Nondisjunction.
Nondisjunction is the failure of homologous chromosomes (chromatids) to separate properly during meiotic cell division. A, Nondisjunction at the first meiotic division. B, Nondisjunction at the second meiotic division.
(Courtesy Dr. M.A. Miller, College of Veterinary Medicine, Purdue University; and Dr. J.F. Zachary, College of Veterinary Medicine, University of Illinois.)
