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Down syndrome - Symptoms and causes - Mayo Clinic
https://www.mayoclinic.org/diseases-conditions/down-syndrome/symptoms-causes/syc-20355977
WEBMar 8, 2018 · Down syndrome is a genetic disorder caused when abnormal 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. Down syndrome varies in severity among individuals, causing lifelong intellectual disability and …
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Facts about Down Syndrome | CDC
https://www.cdc.gov/ncbddd/birthdefects/downsyndrome.html
WEBLast Reviewed: October 10, 2023. Source: National Center on Birth Defects and Developmental Disabilities, Centers for Disease Control and Prevention. Down syndrome is a condition in which a person has an extra chromosome. Learn …
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Down syndrome - Wikipedia
https://en.wikipedia.org/wiki/Down_syndrome
WEBDown syndrome is the most common chromosomal abnormality. It occurs in about 1 in 1,000 babies born each year. In the US this figure is given as one in 700 births. In 2015, Down syndrome was present in 5.4 million individuals globally and resulted in 27,000 deaths, down from 43,000 deaths in 1990.
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Down Syndrome: Symptoms & Causes - Cleveland Clinic
https://my.clevelandclinic.org/health/diseases/17818-down-syndrome
WEBDown 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.
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About Down Syndrome | National Down Syndrome Society (NDSS)
https://ndss.org/about
WEBApr 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 associated with Down syndrome.
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Down Syndrome: Causes, Types, and Symptoms - Healthline
https://www.healthline.com/health/down-syndrome
WEBNov 28, 2023 · 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,...
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Down Syndrome - NICHD - Eunice Kennedy Shriver National …
https://www.nichd.nih.gov/health/topics/factsheets/downsyndrome
WEBNov 22, 2023 · Down syndrome is a set of cognitive and physical symptoms that result from having an extra chromosome 21 or an extra piece of that chromosome. 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.
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About Down Syndrome - National Human Genome Research …
https://www.genome.gov/Genetic-Disorders/Down-Syndrome
WEBJun 29, 2017 · Down syndrome is a chromosomal condition related to chromosome 21. It affects 1 in 800 to 1 in 1000 live born infants. What are the symptoms of Down syndrome? People who have Down syndrome have learning difficulties, mental disability, a characteristic facial appearance, and poor muscle tone (hypotonia) in infancy.
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Down syndrome: MedlinePlus Genetics
https://medlineplus.gov/genetics/condition/down-syndrome/
WEBDown syndrome is a chromosomal condition that is associated with intellectual disability, a characteristic facial appearance, and weak muscle tone (hypotonia) in infancy. All affected individuals experience cognitive delays, but the intellectual disability is usually mild …
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Down syndrome - Diagnosis and treatment - Mayo Clinic
https://www.mayoclinic.org/diseases-conditions/down-syndrome/diagnosis-treatment/drc-20355983
WEBMar 8, 2018 · Diagnostic tests can identify or diagnose whether your baby has Down syndrome. Your health care provider can discuss the types of tests, advantages and disadvantages, benefits and risks, and the meaning of your results. If appropriate, your provider may recommend that you talk to a genetics counselor.
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