Nondisjunction is the failure of separation of the chromosomal pair during anaphase stage of cell division. The nondisjunction results in an extra copy of one chromosome in one gamete and no copy of a chromosome in the other gamete. The failure in the separation of the chromosome can occur in any of the two meiotic stages because both can result in the extra chromosome or lack of chromosome in gametes.

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Chapter 10, Problem 5FIB

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Nondisjunction is the failure of separation of the chromosomal pair during anaphase stage of cell division. The nondisjunction results in an extra copy of one chromosome in one gamete and no copy of a chromosome in the other gamete. The failure in the separation of the chromosome can occur in any of the two meiotic stages because both can result in the extra chromosome or lack of chromosome in gametes.

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