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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.
Mosaic Down syndrome: Only some cells in the person have an extra copy of chromosome 21. This genetic cause is considered rare. This genetic cause is considered rare.
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 ...
An anaphase lag of a chromosome 21 in a Down syndrome embryo leads to a fraction of euploid cells (2n cells), phenomenon described as "aneuploidy rescue". There is considerable variability in the fraction of cells with trisomy 21, both as a whole and tissue-by-tissue. This is the cause of 1–2% of the observed Down syndromes. [4]
Down syndrome is the most common genetic condition in the U.S. Approximately 400,000 Americans have Down syndrome. Here are amazing individuals with Down syndrome who are breaking the barriers of ...
Brushfield spots are more commonly found in Down syndrome patients of European descent than similarly affected children of Asian heritage. [3] Brushfield spots comprise focal areas of iris stromal hyperplasia, surrounded by relative hypoplasia. Similar spots described by Krückmann [4] and Wolfflin [5] are found in individuals without Down ...
March 21 (3/21) is World Down Syndrome Day, chosen because people with Down Syndrome have three copies of the 21st chromosome instead of the usual two. "Gabe lives his life to the fullest," Nick ...
Hypotrichosis–acro-osteolysis–onychogryphosis–palmoplantar keratoderma–periodontitis syndrome; Hypotrichosis–lymphedema–telangiectasia syndrome; Hystrix-like ichthyosis–deafness syndrome