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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: 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 ...

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: Get the Facts on Symptoms - MedicineNet

www.medicinenet.com/down_syndrome_overview/article.htm

Jun 11, 2015 ... Read about Down syndrome facts, symptoms, tests, statistics, treatment, and ... Read more about Down syndrome causes and symptoms » ...

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 ...

Down Syndrome - Learn Genetics - University of Utah

learn.genetics.utah.edu/content/disorders/chromosomal/down/

Down syndrome is a developmental disorder caused by an extra copy of chromosome 21 (which is why the disorder is also called "trisomy 21"). Having an extra ...

Understanding What Causes Down Syndrome - Verywell

www.verywell.com/what-causes-down-syndrome-1120486

May 8, 2015 ... Down syndrome is caused by an extra number 21 chromosome. But what does this really mean? To really understand what causes Down ...

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 ...

Answers
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