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Mar 8, 2018 · Down syndrome is a genetic disorder caused by an extra copy of chromosome 21. It affects intellectual and developmental abilities, and may cause health problems such as heart and gastrointestinal disorders. Learn more about the diagnosis, treatment and support for Down syndrome.
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. [3] It is usually associated with developmental delays, mild to moderate intellectual disability, and characteristic physical features.
- Third copy of chromosome 21
- Mostly at conception, rarely after fertilization
6 days ago · Down syndrome is a condition caused by an extra chromosome 21 that affects mental and physical development. Learn about the three types of Down syndrome, the causes, risk factors, diagnosis, and health problems associated with this condition.
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Down syndrome is a genetic condition where a person has an extra copy of chromosome 21. Learn about the physical, cognitive and behavioral symptoms, the types and causes of Down syndrome, and how it's diagnosed before and after birth.
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Apr 6, 2021 · Learn about the causes, types, symptoms, and research of Down syndrome, a genetic condition that occurs when an individual has a full or partial extra copy of chromosome 21. Find out how common, how to prevent, and how to support people with Down syndrome and their families.
Nov 28, 2023 · Down syndrome is a condition in which a child is born with an extra copy of the 21st chromosome. It causes physical and mental developmental delays and disabilities. Learn about the causes, types, symptoms, screening, treatment and outlook for people with Down syndrome.
Nov 22, 2023 · Down syndrome is a set of cognitive and physical symptoms that result from having an extra copy or part of a copy of chromosome 21. It is the most common chromosomal cause of mild to moderate intellectual disabilities. People with Down syndrome are at risk for several other health conditions, such as heart abnormalities, hearing loss, vision problems, and Alzheimer's disease.
