Down syndrome is a condition that occurs when a person has an additional copy of chromosome 21, explains the National Down Syndrome Society. As of 2015, Down syndrome is the most common chromosomal condition. Individuals... More »

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Down syndrome is a genetic disorder that causes intellectual and developmental delays, according to the National Down Syndrome Society. It is caused by abnormal cell division that results in additional unnecessary geneti... More »

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People with mosaic Down syndrome can manifest all, some or none of the symptoms of the more common form of Down syndrome, including short stature, slanted eyes, intellectual disability and heart defects. Due to the way m... More »

Down syndrome is a genetic disorder that causes intellectual and developmental delays, according to the National Down Syndrome Society. It is caused by abnormal cell division that results in additional unnecessary geneti... More »

www.reference.com Health Conditions & Diseases

Most cases of Down syndrome are not genetic, with only 1 percent of cases considered hereditary, according to the National Down Syndrome Society. The remaining 99 percent of cases are random. One of every 691 babies born... More »

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People can find information on Down syndrome from the March of Dimes, National Down Syndrome Congress and the National Down Syndrome Society, which also have many online resources. Down syndrome is a chromosome-related d... More »

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The National Association for Down Syndrome, or NADS and the National Down Syndrome Society, or NDSS, are two prominent organizations in the United States that provide advocacy programs for people with Down syndrome and t... More »

www.reference.com Health Conditions & Diseases