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Down syndrome - Wikipedia

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

Apr 19, 2014 ... 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 ...

What causes Down syndrome? - NICHD - National Institutes of Health

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

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 called ...

Down Syndrome: Facts, Symptoms, and Characteristics - Medical ...

www.medicalnewstoday.com/articles/145554.php

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/down_syndrome_overview/article.htm

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

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

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

Down syndrome is a lifelong condition in which a person is born with distinct physical features and some degree of cognitive disability.

What Is Down Syndrome? - National Down Syndrome Society

www.ndss.org/Down-Syndrome/What-Is-Down-Syndrome/

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

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 disabilities.

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.