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Down Syndrome : Causes

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Causes Overview Articles

Down syndrome
In most cases, Down syndrome occurs when there is an extra copy of chromosome 21. This form of Down syndrome is called Trisomy 21.
Source:ADAM
Date:May 12, 2009
Down Syndrome
The disease is caused by trisomy 21, meaning their bodies' cells have an extra chromosome 21.(© Lester V. Bergman/Corbis.).
Source:Gale Encyclopedia of Children's Health
Down syndrome
In approximately one to two percent of Down syndrome cases, the original egg and sperm cells contain the correct number of chromosomes, 23 each. The problem occurs sometime shortly after fertilization—during the phase when cells are dividing...
Source:Gale Encyclopedia of Genetic Disorders Part I
Down Syndrome
Down syndrome is usually the result of an extra copy of chromosome 21(trisomy 21). As described earlier, Down syndrome may occur because of: nondisjunction within the sperm, or more commonly, the egg cell; genetic mosaicism, which occurs after con...
Source:Gale Encyclopedia of Nursing and Allied Health
Down Syndrome
In approximately one to two percent of Down syndrome cases, the original egg and sperm cells contain the correct number of chromosomes, 23 each. The problem occurs sometime shortly after fertilization—during the phase when cells are dividing...
Source:Gale Encyclopedia of Genetic Disorders Part II
Down Syndrome
While Down syndrome is a chromosomal disorder, a baby is usually identified at birth through observation of a set of common physical characteristics. Babies with Down syndrome tend to be overly quiet, less responsive, with weak, floppy muscles.
Source:Gale Encyclopedia of Medicine

Specific Causes Articles

Down Syndrome (Trisomy 21)
Detailed information on trisomy 21, also called Down syndrome, including cause, diagnosis, prevention, and research
Source:StayWell
Down Syndrome (Trisomy 21)
Detailed information on trisomy 21, also called Down syndrome, including cause, diagnosis, prevention, and research
Source:StayWell
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