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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 teacher checklist concentrated on behaviors more likely to occur in a school setting. In 1990, Dr. Gabrielle Carlson adapted the parent checklist from the CSI-3R for adolescent use, creating the first version of the Adolescent Symptom Inventory (ASI-3R). With the publication of the DSM-IV in 1994, the CSI-4 emerged to accommodate changes.
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 ...
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 ...
The Pediatric Symptom Checklist (PSC) is a 35-item parent-report questionnaire designed to identify children with difficulties in psychosocial functioning. Its primary purpose is to alert pediatricians at an early point about which children would benefit from further assessment. [ 1 ]
The National Down Syndrome Congress (NDSC) is a national not-for-profit organization that provides individuals, families, and health care providers information [4] and support [5] about Down syndrome, as well as advocating with and on behalf of individuals with Down syndrome. [6] The NDSC provides free, up-to-date information concerning all ...
The 21st day of March (the 3rd month of the year) was selected to signify the uniqueness of the triplication of the 21st chromosome which causes Down syndrome. The General Assembly of the United Nations has decided to observe it each year since 2012. [2] Every year on March 21, World Down Syndrome Day is observed to create awareness about Down ...