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The karyotype for trisomy 21 illustrates an example of a genetic mutation caused by

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CelTheDemonid
If you didn't know already, trisomy 21 is also known as Down Syndrome. It is caused by error in the cell division which is called nondisjunction. It leaves a sperm or egg cell with an extra copy of chromosome 21 before or after conception.
Alahnawigfallid

The answer is D.) Nondisjunction

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