Individuals with Down’s Syndrome have a trisomy of chromosome 21 that arose from a single error in meiosis. Imagine a child, Bella, who has parents with normal karyotypes. Only one of Bella’s chromosome 21’s carries an SNP as found in her father. Which of the following stages of meiosis could this error have occurred?
A) Meiosis I in the mother
B) Meiosis I in the father
C) Meiosis II in the mother
D) Meiosis II in the father
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