Question

at what phase can nondisjunction occur? prophase i metaphase ii anaphase i or ii

Explanation:

Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate properly during cell division. In meiosis, homologous chromosomes separate in Anaphase I and sister chromatids separate in Anaphase II. If separation fails in either of these phases, nondisjunction occurs. Prophase I is for chromosome condensation and crossing - over, and Metaphase II is for chromosome alignment, not separation.

Answer:

Anaphase I or II