The most common type of Down syndrome is trisomy 21.

Name: The most common type of Down syndrome is trisomy 21.
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Trisomy 21 is the most common type of Down syndrome, where there is an extra copy of chromosome 21, resulting in a total of three copies instead of the usual two. This accounts for about 95% of cases of Down syndrome. The other two types, mosaic Down syndrome and translocation Down syndrome, are much rarer.

The Most Common Type of Down Syndrome Is Trisomy 21