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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.
Down Syndrome Centre (DSC) is a registered charity in Ireland. [1] It was set up in 2002 by parents of children with Down syndrome . The aim of the charity is to establish support centres in Ireland which provide a range of support services.
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 was born in Torpoint, Cornwall, the youngest of seven children of the merchant Thomas Joseph Down. [1] His father was originally from Derry in Ireland, and his mother, Hannah Haydon, from North Devon. [2] His father was descended from an Irish family, his great-great grandfather having been the Protestant Bishop of Derry and Raphoe. [3]
Down syndrome is the most common genetic cause of intellectual disability. Among children, the cause of intellectual disability is unknown for one-third to one-half of cases. [11] About 5% of cases are inherited. [12] Genetic defects that cause intellectual disability, but are not inherited, can be caused by accidents or mutations in genetic ...
Living among a small band of Neanderthals in what is now eastern Spain was a child, perhaps 6 years old, with Down syndrome, as shown in a remarkable fossil preserving traits in the inner ear ...
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 ...
A child with Down syndrome. A prominent example of a genetically determined neurodevelopmental disorder is trisomy 21, also known as Down syndrome. This disorder usually results from an extra chromosome 21, [41] although in uncommon instances it is related to other chromosomal abnormalities such as translocation of the genetic material.