Answer
d. Both meiosis I and meiosis II are correct
Work Step by Step
Nondisjunction is the failure of chromosomes to separate properly during cell division.
It can occur in:
Meiosis I – homologous chromosomes fail to separate, leading to gametes with an extra or missing chromosome.
Meiosis II – sister chromatids fail to separate, also producing gametes with abnormal chromosome numbers.
