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trisomy 21

trisomy 21 Trisomy 21 is a genetic condition in which chromosome 21 is present in extra full or partial form.

Trisomy 21 is a genetic condition in which chromosome 21 is present in extra full or partial form. It is linked with a recognizable pattern of physical differences, moderate to severe intellectual disability, and higher rates of heart and digestive abnormalities, leukemia, and unusually early Alzheimer-type brain disease.

Also see

Sources

Drafting source: U.S. National Library of Medicine. Medical Subject Headings (MeSH), 2026 descriptor edition. “Down Syndrome” (D004314).
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PsychTerms (psychterms.org), CC BY 4.0, version 1. “trisomy 21.” Development preview.

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