Web Results
Find Health Information on Healthline
Find Info About:
Healthline is the leading provider of health information.

Down syndrome - Wikipedia


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


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


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 ...


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


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 ...


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


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


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


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.