Down syndrome - Wikipedia
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 …
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Down syndrome - Symptoms and causes - Mayo Clinic
Nov 12, 2024 · Down syndrome varies in severity among individuals. The condition causes lifelong intellectual disability and developmental delays. It's the most common genetic chromosomal cause of …
Down Syndrome: Causes, Symptoms, Diagnosis, and Treatment - WebMD
Jan 24, 2026 · Down syndrome is a genetic condition that causes mild to significant physical and developmental problems. People with Down syndrome (DS) are born with an extra chromosome. …
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Facts, Myths, & Truths About Down Syndrome - NDSS
Down syndrome occurs when an individual has a full or partial extra copy of chromosome 21. This additional genetic material alters the course of development and causes the characteristics …
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Down's Syndrome: Symptoms, Medical Conditions, Support - Patient
Apr 27, 2025 · Down's syndrome (also known as Down syndrome) is a genetic chromosome problem. Someone with Down's syndrome has an extra copy of chromosome 21 in the cells of their body. This …
About Down Syndrome | National Down Syndrome Society (NDSS)
Apr 6, 2021 · Down syndrome occurs when an individual has a full or partial extra copy of chromosome 21. This additional genetic material alters the course of development and causes the characteristics …