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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]
1. You're Given the Senior Discount on Sight. The first time this happens, it's gut-wrenching: A 20-something selling tickets at the movies glances up and gives you the senior discount, even ...
Licensed marriage and family therapist Kati Morton broke down the eight signs of “eldest daughter syndrome” in a TikTok video that has been viewed over 6 million times.
In addition to Down syndrome, pregnant women over 35 are also at increased risk for other birth defects. A study conducted by Gill et al. found an association of advanced maternal age >40 and birth defects such as cardiac issues, esophageal atresia, hypospadias, and craniosynostosis. [36]
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