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  2. Down syndrome - Wikipedia

    en.wikipedia.org/wiki/Down_syndromeCached

    Down syndrome (DS or DNS), 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. What Is Down Syndrome? Facts, Causes, Symptoms

    www.medicinenet.com/down_syndrome_overview/...Cached

    Down syndrome is a genetic disorder and the most common autosomal chromosome abnormality in humans, where extra genetic material from chromosome 21 is transferred to a newly formed embryo. These extra genes and DNA cause changes in development of the embryo and fetus resulting in physical and mental ...

  4. What is Down Syndrome? | National Down Syndrome Society

    www.ndss.org/about-down-syndrome/down-syndromeCached

    Down syndrome is a condition or a syndrome, not a disease. People “have” Down syndrome, they do not “suffer from” it and are not “afflicted by” it.

  5. Down syndrome - Symptoms and causes - Mayo Clinic

    www.mayoclinic.org/diseases-conditions/down...Cached

    Down syndrome is a genetic disorder caused when abnormal cell division results in extra genetic material from chromosome 21.

  6. Down Syndrome: Causes, Symptoms, Diagnosis, & Treatment

    www.webmd.com/.../understanding-down-syndrome-basicsCached

    People with Down syndrome have an extra chromosome that impacts how a person looks and their ability to think, learn, and reason. Find out the type, causes, and kinds of effects it can have.

  7. Down Syndrome - KidsHealth

    kidshealth.org/en/parents/down-syndrome.htmlCached

    Down syndrome (DS), also called Trisomy 21, is a condition in which a person is born with an extra chromosome. Chromosomes contain hundreds, or even thousands, of genes. Genes carry the information that determines your traits (features or characteristics passed on to you from your parents). With ...

  8. Down syndrome - Genetics Home Reference - NIH

    ghr.nlm.nih.gov/condition/down-syndromeCached

    Down 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 to moderate. People with ...

  9. Down Syndrome | Birth Defects | NCBDDD | CDC

    www.cdc.gov/ncbddd/birthdefects/downsyndrome.htmlCached

    Down syndrome is a condition in which a person has an extra chromosome. Chromosomes are small “packages” of genes in the body. They determine how a baby’s body forms during pregnancy and how the baby’s body functions as it grows in the womb and after birth. Typically, a baby is born with 46 ...

  10. The leading human rights organization for all individuals with Down syndrome.

  11. National Association for Down Syndrome 1460 Renaissance Drive Suite #102 Park Ridge, IL 60068. Phone: 630.325.9112; Email: info@nads.org

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