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Down syndrome - Wikipedia
Down syndrome or Down's syndrome, also known as trisomy 21, is a genetic disorder caused by the presence of all or part of a third copy of chromosome 21. It is usually associated with physical growth delays, mild to moderate intellectual disability, and characteristic facial features. The average IQof a young adult with Down syndrome is 50, equivalent to the mental ability of an eight- or nine-year-old child, but this can va…
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Down syndrome Definition & Meaning - Merriam-Webster
The meaning of Down syndrome is a congenital condition characterized especially by developmental delays, usually mild to moderate impairment in cognitive functioning, short stature, upward slanting eyes, a flattened nasal bridge, broad hands with short fingers, decreased muscle tone, and by trisomy of the human chromosome numbered 21 —called also trisomy 21.
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What is Down Syndrome - dsrf.org
Down syndrome is a genetic condition caused by an extra chromosome. It occurs in one in 700 - 900 live births and results when the fetus ends up with three copies of chromosome 21 instead of two.
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How would you describe Down syndrome?
Down syndrome. n. A congenital disorder caused by the presence of an extra 21st chromosome and marked usually by moderate to severe intellectual disabilities, short stature, and a flattened facial profile.
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What are three types of Down syndrome?
There are three types of Down syndrome: Trisomy 21 (nondisjunction), Mosaicism, and Translocation.
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What is Down syndrome most commonly caused by?
Down syndrome is by far the most common and best known chromosomal disorder in humans and the most common cause of intellectual disability. It is primarily caused by trisomy of chromosome 21 (see the image below), which gives rise to multiple systemic complications as part of the syndrome.
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