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

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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
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