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it can cause Trisomy 21 because an extra chromosome can be added.

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12y ago

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Nondisjunction is a process during cell division where chromosomes fail to separate correctly. In Trisomy 21, an individual has three copies of chromosome 21 instead of the usual two, which is caused by nondisjunction during either meiosis I or meiosis II in the formation of gametes. When a gamete with an extra copy of chromosome 21 is fertilized, it results in an individual with Down syndrome.

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9mo ago
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Q: How does nondisjunction cause Trisomy 21?
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