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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 ...
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]
An 8-year-old boy with Down syndrome is being hailed as a hero after he rescued his 14-year-old sibling from a raging fire that destroyed their Colorado home Sunday.
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 ...
Used of people with Down Syndrome. A Dutch profanity sometimes appearing in English as "downy" and generally considered derogatory [32] Dumb: Especially when preceded by "the" [17] [22] Dummy and dumb Used of people with mental disabilities, or more generally people perceived as stupid or ignorant.
Every day, thousands of new parents leave the hospital with a little one in their arms for the very first time.
In the main, the paper is about what is known as Down syndrome, named after him, but which he classified as the Mongolian type of idiot. [8]: 21 As a result, Down syndrome was also known as "Mongolism" and people with Down syndrome referred to as "Mongoloids". Down's original terminology, later deemed racist, continued to be used colloquially ...