Question: the mating of an aa male and an aa female...

The mating of an Aa male and an aa female produced an offspring with the genotype Aaa. Therefore, the resulting offspring has 3 copies of gene 1 (trisomy for Chromosome 1). At what stage during meiosis did the non-disjunction event occur and in which parent? Check all of the options that apply.

1. Paternal non-disjunction in meiosis I
2. Maternal non-disjunction in meiosis I
3. Paternal non-disjunction in meiosis II
4. Maternal non-disjunction in meiosis II