National Down Syndrome Awareness Month–1 of 21
October 3, 2016
Let’s start at the beginning.
- Down syndrome occurs when an individual has a full or partial extra copy of chromosome 21.
- One in every 691 babies in the United States is born with Down syndrome.
- There are three types of Down syndrome: trisomy 21 (nondisjunction) accounts for 95% of cases, translocation accounts for about 4%, and mosaicism accounts for about 1%.
- Down syndrome is the most commonly occurring chromosomal condition.
- Down syndrome occurs in people of all races and economic levels.
(Source: NDSS)
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