1. Down Syndrome Today
... including impaired learning, social, and vocational ability. It is a disorder in which a person's overall intellectual functioning is well below average, with an IQ of 70 or less. Down Syndrome has a universalized definition found correspondingly in almost all sources: A congenital disorder, caused by the presence of an ... 1%. Mosaic trisomy implies that some but not all cells have the defect. Individuals with mosaic trisomy typically score 10-30 points higher on IQ tests than children with translocation and trisomy 21. (Batshaw 1997) The diagnosis of Down syndrome is usually suspected ...
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