Which of the following leads to gametes receiving incorrect numbers of sex chromosomes?

Question

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Non-disjunction is the failure of sister chromatids or homologous chromosomes to separate during meiosis I or II respectively, which results in gametes receiving an incorrect number of chromosomes. This can lead to aneuploidy, which is an abnormal number of chromosomes, including incorrect numbers of sex chromosomes. Apoptosis is programmed cell death and does not lead to incorrect numbers of sex chromosomes. Synapsis is the pairing of homologous chromosomes during prophase I of meiosis, which does not lead to incorrect numbers of sex chromosomes.

Which of the Following Leads to Gametes Receiving Incorrect Numbers