Down syndrome - Symptoms and causes - Mayo Clinic
2024年11月12日 · Down syndrome is a genetic condition caused when an unusual cell division results in an extra full or partial copy of chromosome 21. This extra genetic material causes the developmental changes and physical features of Down syndrome. The term "syndrome" refers to a set of symptoms that tend to happen together.
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 developmental delays, mild to moderate intellectual disability, …
Down Syndrome | Birth Defects | CDC - Centers for Disease …
2024年10月28日 · Down syndrome is a genetic condition where a person is born with an extra chromosome. This can affect how their brain and body develop. People diagnosed with Down syndrome can lead healthy lives with supportive care. Down syndrome is a condition in which a person has an extra copy of chromosome 21.
Down Syndrome: Symptoms & Causes - Cleveland Clinic
Down syndrome is a genetic condition where a person is born with an extra copy of chromosome 21. This means that they have a total of 47 chromosomes instead of 46. This can affect how their brain and body develop. People diagnosed with Down syndrome have happy and healthy lives with supportive care. Down syndrome can affect how your child develops.
Down Syndrome - StatPearls - NCBI Bookshelf - National Center …
2023年8月8日 · Down syndrome (trisomy 21) is a genetic disorder caused by the presence of all or a portion of a third chromosome 21. Patients typically present with mild to moderate intellectual disability, growth retardation, and characteristic facial features.
Down Syndrome: Causes, Symptoms, Diagnosis, and Treatment - WebMD
2024年2月23日 · 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....
Down Syndrome: Causes, Types, and Symptoms - Healthline
2023年11月28日 · Down syndrome (sometimes called Down’s syndrome) is a condition in which a child is born with an extra copy of their 21st chromosome — hence its other name, trisomy 21. This causes physical and...
Living with Down Syndrome | Birth Defects | CDC
2024年5月16日 · Down syndrome is the most common chromosomal condition diagnosed in the United States. Families and healthcare providers in the United States have learned over time how to improve care for people living with Down syndrome. Children with Down syndrome are living longer, many into their adult years.
About Down Syndrome | National Down Syndrome Society (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 associated with Down syndrome.
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 associated with Down syndrome.
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