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Down syndrome is caused by the presence of a third chromosome 21

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Down syndrome is caused by the presence of a third chromosome 21

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Edwards' syndrome

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Trisomy 18 syndrome

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trisomy

There several types of trisomy, the most well known is probably Down syndrome, which is trisomy 21.

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Trisomy 18 occurs in approximately one in every 3,000 newborns

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