- Last edited on March 3, 2021
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child:genetic-disorders:down-syndrome-trisomy-21 [on April 12, 2019] |
child:genetic-disorders:down-syndrome-trisomy-21 [on May 20, 2019] |
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===== Primer ===== | ===== Primer ===== | ||
- | **Down Syndrome** (Trisomy 21) is the most common identifiable genetic cause of [[child:intellectual-disability:home|intellectual disability]]. It is due to the presence of all or part of a third copy of chromosome 21. Individuals with Down syndrome have a characteristic facial appearance and hypotonia in infancy. About half are born with a heart defect. | + | **Down Syndrome** (Trisomy 21) is the most common identifiable genetic cause of [[child:intellectual-disability|intellectual disability]]. It is due to the presence of all or part of a third copy of chromosome 21. Individuals with Down syndrome have a characteristic facial appearance and hypotonia in infancy. About half are born with a heart defect. |
== Epidemiology == | == Epidemiology == |