| Down Syndrome Down syndrome is the most common and readily identifiable chromosomal condition associated with mental retardation. It is caused by a chromosomal abnormality: for some unexplained reason, an accident in cell development results in 47 instead of the usual 46 chromosomes. This extra chromosome changes the orderly development of the body and brain. In most cases, the diagnosis of Down syndrome is made according to results from a chromosome test administered shortly after birth. From: Down Syndrome Fact Sheet - NICHCY Web Resources for Down Syndrome: National Down Syndrome Society National Association For Down Syndrome National Down Syndrome Congress Down Syndrome - MSN Encarta Encyclopedia Autism - Google Search |
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