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Down syndrome

en.wikipedia.org/wiki/Down_syndrome

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.

Down syndrome Causes - Mayo Clinic

www.mayoclinic.org/diseases-conditions/down-syndrome/basics/causes/con-20020948

About 95 percent of the time, Down syndrome is caused by trisomy 21 — the child has three copies of chromosome 21 (instead of the usual two copies) in all ...

What causes Down syndrome?

www.nichd.nih.gov/health/topics/down/conditioninfo/pages/causes.aspx

Jan 17, 2014 ... Down syndrome is caused by a random error in cell division that results in the presence of an extra copy of chromosome 21. The type of error is ...

Down Syndrome - Symptoms, Causes, Diagnosis and Treatment ...

www.webmd.com/children/tc/down-syndrome-topic-overview

Down syndrome is a set of physical and mental traits caused by a gene problem that happens before birth. Children who have Down syndrome tend to have ...

Down Syndrome: Causes, Types & Symptoms - Healthline

www.healthline.com/health/down-syndrome

Oct 28, 2015 ... Down syndrome is the most common genetic condition in the United States. It causes physical and mental developmental delays and ...

Trisomy 21 Causes Down Syndrome | Learn Science at Scitable

www.nature.com/scitable/topicpage/trisomy-21-causes-down-syndrome-318

A century after Down syndrome was first described, scientists discovered that the root cause of this disorder is a condition called trisomy 21. What strides in ...

Down Syndrome: Trisomy 21 - Causes, Symptoms and Risks

americanpregnancy.org/birth-defects/down-syndrome/

Down syndrome aka trisomy 21 is the most common birth defect in the United States. Learn more about the causes, symptoms and risks of Down Syndrome.

Down Syndrome | Birth Defects | NCBDDD | CDC

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

Mar 3, 2016 ... Down syndrome is also referred to as Trisomy 21. This extra copy changes how the baby's body and brain develop, which can cause both ...

Trisomy 21: The Origin of Down Syndrome

www.ds-health.com/trisomy.htm

In the first part of the twentieth century, there was much speculation of the cause of Down syndrome. The first people to speculate that it might be due to ...

Down Syndrome - KidsHealth

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

Down syndrome is a condition in which extra genetic material causes delays in the way a child develops, both physically and mentally.

Answer
Down Syndrome
Down syndrome is a genetic abnormality that occurs due to an extra copy of chromosome 21. It causes lifelong developmental delays that can range from moderate to severe. It cannot be cured but can be managed with educational interventions, specialized parenting techniques, and community engagement. These all can encourage a person with Down syndrome to develop life skills and social bonds. Many Down syndrome patients live past the age of 50. More »
Source: healthline.com
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Down Syndrome: Facts, Symptoms, and Characteristics - Medical ...

www.medicalnewstoday.com

Down syndrome, also known as trisomy 21, is a genetic disorder. Down syndrome is caused by an extra copy of ...

What Is Down Syndrome? Facts, Causes, Symptoms - MedicineNet

www.medicinenet.com

Aug 22, 2016 ... Down syndrome is a condition caused by chromosome replication errors. A baby born with Down syndrome may have symptoms such as ...

What Is Down Syndrome? - National Down Syndrome Society

www.ndss.org

This additional genetic material alters the course of development and causes the characteristics associated with Down syndrome. A few of the common physical ...