BioScience Dictionary

 
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Found Down syndrome . 1 time.

Displaying results 1 to 10.

1. Down syndrome (Down's syndrome, trisomy 21).
An uncommon (1 in 1000 births) congenital disorder in which a person is born with three copies of chromosome 21. It is more common among children born to mothers over the age of 35. People with this disorder have physical and mental retardation to varying degrees and typically have facial defects, vision, respiratory and cardiac problems. This disorder was formerly known as mongolism.