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Down syndrome or Down's syndrome, [12] also known as trisomy 21, is a genetic disorder caused by the presence of all or part of a third copy of chromosome 21. [3] It is usually associated with developmental delays, mild to moderate intellectual disability , and characteristic physical features.
The average IQ of a young adult with Down syndrome is 50, equivalent to the mental age of an 8- or 9-year-old child, but this number varies widely. [3] At the same time, they enjoy a rich social and emotional awareness. [4] Down syndrome is the most common chromosome abnormality in humans, [3] occurring in about one per 1000 babies born each ...
His grandson, Reginald's son, was born in 1905 with Down syndrome. [12] Down's institution was later absorbed into the National Health Service in 1952. [6] A century after Down's death, his contributions to the field of medicine were celebrated at the Mansell Symposium in the Medical Society of London, and the Royal Society of Medicine ...
The second, combined with a normal gamete from the other parent, gives rise to a typical child. The third leads to a translocation Down syndrome child. The last becomes a translocation carrier, like the parent. Translocation Down syndrome is often referred to as familial Down syndrome. It is the cause of about 4.5% of the observed Down ...
Down Syndrome Symptoms Down syndrome is usually diagnosed during pregnancy through genetic screening or at birth through diagnostic tests. There are some distinct physical features that typically ...
Pages in category "People with Down syndrome" The following 24 pages are in this category, out of 24 total. This list may not reflect recent changes. *
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Its headquarters is at the Langdon Down Centre, formerly Normansfield Hospital, built as a private hospital by John Langdon Down, the "Father of Down's Syndrome". [4] The Langdon Down Centre includes the Langdon Down Museum of Learning Disability about the history of treating people with learning disabilities, and the Normansfield Theatre.