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Down syndrome or Down's syndrome, [12] also known as trisomy 21, is a genetic disorder caused by the presence of all or part of a third copy of chromosome 21. [3] It is usually associated with developmental delays, mild to moderate intellectual disability , and characteristic physical features.
According to the Centers for Disease Control, each year about 6,000 babies are born with Down syndrome, making it the most common chromosomal disorder. That's about 1 in every 700 newborns. That's ...
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Karyotype of a human with Trisomy 21 (Down syndrome). Trisomies can occur with any chromosome, but often result in miscarriage rather than live birth.For example, Trisomy 16 is most common in human pregnancies, occurring in more than 1%, but the only surviving embryos are those having some normal cells in addition to the trisomic cells (mosaic trisomy 16). [3]
The average IQ of a young adult with Down syndrome is 50, equivalent to the mental age of an 8- or 9-year-old child, but this number varies widely. [3] At the same time, they enjoy a rich social and emotional awareness. [4] Down syndrome is the most common chromosome abnormality in humans, [3] occurring in about one per 1000 babies born each ...
Life expectancy was relatively flat in the ’60s, rising less than a year from 1960 to 1970. Women added about 18 months to their lifespans, while men added only half a year.
It is the second-most common condition due to a third chromosome at birth, after Down syndrome for a third chromosome 21. [4] Trisomy 18 occurs in around 1 in 5,000 live births. [3] Many of those affected die before birth. [3] Some studies suggest that more babies that survive to birth are female. [2] Survival beyond a year of life is around 5 ...
Approximately one in every 775 babies in the United States is born with Down syndrome, according to the National Down Syndrome Society.I learned this statistic firsthand when my daughter Molly was ...