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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]
Down syndrome is a genetic condition in which people are born with an extra copy of chromosome 21. This extra copy affects the development of the body and brain, causing a range of physical and mental impairments for the individual. Fragile X syndrome, most frequent among males, is thought to cause autism and intellectual disability.
When a syndrome is named after a person, there is some difference of opinion as to whether it should take the possessive form or not (e.g. Down syndrome vs. Down's syndrome). North American usage has tended to favor the non-possessive form, while European references often use the possessive. [19]
First major character with Down syndrome on a television series, portrayed by a person who also has Down syndrome. Chris Burke [113] 2018 Penny Stevenson: Doctors: She was born with a right arm that ends just below the elbow. Cerrie Burnell [114] 1994 Kerry Weaver: ER: Limp in her gait due to congenital hip dysplasia: Laura Innes [115] [116 ...
Pages in category "Down syndrome in film" The following 44 pages are in this category, out of 44 total. This list may not reflect recent changes. A. AfterLife (film)
Pages in category "Down syndrome" The following 16 pages are in this category, out of 16 total. This list may not reflect recent changes. ...