About Down syndrome

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 developmental delays, mild to moderate intellectual disability, and characteristic physical features.

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Facts from Wikidata (CC0). Image by Vanellus Foto via Wikimedia Commons (CC BY-SA 3.0).

Down syndrome

chromosomal condition

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About Down syndrome

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Facts from Wikidata (CC0). Image by Vanellus Foto via Wikimedia Commons (CC BY-SA 3.0).