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Sonja Rasmussen, M.D., professor of genetic medicine at the Johns Hopkins University School of Medicine, explains how Down syndrome and mosaic Down syndrome differ. “Typically, we all have 46 ...
This is the cause of 1–2% of the observed Down syndromes. [4] There is evidence that mosaic Down syndrome may produce less developmental delay, on average, than full trisomy 21. [8] The following diagram shows two possible mechanisms leading to mosaic trisomy 21.
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 ...
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.
Oct. 26—October is Down Syndrome Awareness month — a month to raise awareness and celebrate the many abilities of people with Down syndrome. "I think awareness and education for all ...
A guide to Down syndrome including symptoms and diagnosis of this genetic condition.
Other conditions, such as Beckwith–Wiedemann syndrome, are associated with abnormalities of imprinted genes on the short arm of chromosome 11. Chromosome 14 is also known to cause particular symptoms such as skeletal abnormalities, intellectual disability, and joint contractures , among others.
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