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Down syndrome or Down's syndrome, also known as trisomy 21, is a genetic disorder caused by the presence of all or part of a third copy of chromosome 21. It is usually associated with developmental delays, mild to moderate intellectual disability, and characteristic physical features.
Website. www .ndss .org. The National Down Syndrome Society ( NDSS) is an American organization that offers support to people with Down syndrome, their families, friends, teachers, and coworkers, and educates the general public about Down syndrome. The mission of the NDSS is to be the leading human rights organization for all individuals with ...
Rett syndrome ( RTT) is a genetic disorder that typically becomes apparent after 6–18 months of age and almost exclusively in females. [4] Symptoms include impairments in language and coordination, and repetitive movements. [4] Those affected often have slower growth, difficulty walking, and a smaller head size.
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DiGeorge syndrome, also known as 22q11.2 deletion syndrome, is a syndrome caused by a microdeletion on the long arm of chromosome 22. [7] While the symptoms can vary, they often include congenital heart problems, specific facial features, frequent infections, developmental disability, intellectual disability and cleft palate. [7]
Down syndrome is a chromosomal abnormality characterized by the presence of an extra copy of genetic material on chromosome 21, either in whole ( trisomy 21) or part (such as due to translocations ). The effects of the extra copy varies greatly from individual to individual, depending on the extent of the extra copy, genetic background ...
Down syndrome is a genetic disorder caused by the presence of all or part of a third copy of chromosome 21. It is typically associated with developmental delays, characteristic physical features, and mild to moderate intellectual disability. The average IQ of a young adult with Down syndrome is 50, equivalent to the mental age of an 8- or 9 ...
World Down Syndrome Day (WDSD) is marked each year on March 21, beginning in 2007. The 21st day of March (the 3rd month of the year) was selected to signify the uniqueness of the triplication ( trisomy ) of the 21st chromosome which causes Down syndrome .
John Langdon Haydon Down (18 November 1828 – 7 October 1896) was a British physician best known for his description of the genetic condition now known as Down syndrome, which he originally classified in 1862.
An Act to make provision about meeting the needs of persons with Down syndrome; and for connected purposes. The Down Syndrome Act 2022 (c. 18) is an Act of Parliament introduced as a private member's bill and sponsored by Conservative MP Liam Fox.