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Alternate Name(s): Trisomy 21 ...... Down syndrome is a chromosome abnormality, usually due to an extra copy of the 21st chromosome. This syndrome usually, although not always, results in mental retardation and other conditions.
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www.nlm.nih.gov/medlineplus/ency/article/000997.htm#Def...
www.nlm.nih.gov/medlineplus/ency/article/000997.htm#Definition
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Down syndrome is set of mental and physical symptoms that result from having an extra copy of chromosome 21. Even though people with Down syndrome may have some physical and mental features in common, symptoms of Down syndrome can range from mild to severe.
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www.nlm.nih.gov/medlineplus/downsyndrome.html
www.nlm.nih.gov/medlineplus/downsyndrome.html
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Down syndrome (DS) is a condition in which extra genetic material causes delays in the way a child develops, and often leads to mental retardation. It affects 1 in every 800 babies born. ... Normally, at the time of conception a baby inherits genetic information from its parents in the form of 46 chromosomes:
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kidshealth.org/parent/medical/genetic/down_syndrome.htm...
kidshealth.org/parent/medical/genetic/down_syndrome.html
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To understand why Down syndrome happens, you need to understand a little about chromosomes. What are chromosomes? They're thread-like structures within each cell and are made up of genes. Genes provide the information that determines everything about people, from hair color to whether they are girls or boys.
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kidshealth.org/kid/health_problems/birth_defect/down_sy...
kidshealth.org/kid/health_problems/birth_defect/down_syndrome.html
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Down Syndrome Online offers a comprehensive, reliable and up-to-date range of information, resources and services for families, practitioners and researchers caring for, supporting and investigating Down syndrome. ... Down Syndrome Online offers comprehensive information about Down syndrome, including articles,
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www.down-syndrome.org/
www.down-syndrome.org/
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The Down Syndrome WWW Page was established in February of 1995 and was compiled from the contributions of members of the Down Syndrome Listserv and others. ... A global community that integrates information, resources, and communication opportunities on the Internet for persons with mental retardation and other...
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www.nas.com/downsyn/
www.nas.com/downsyn/
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Down Syndrome Connect - Building friendships, sharing information, asking questions, and providing answers and expertise ... History of Down Syndrome and Useful Information...
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www.downsyndrome.com/
www.downsyndrome.com/
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Down syndrome - Wikipedia, the free encyclopedia
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Down syndrome (the most common term in US English), Down's syndrome (standard in the rest of the English-speaking world), trisomy 21 , or trisomy G is a chromosomal disorder caused by the prese...
en.wikipedia.org/wiki/Down_syndrome
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