Down syndrome

Down syndrome (DS or DNS), also known as trisomy 21, is a genetic disorder caused by the presence of all or part of a third copy of chromosome 21.^[1] It is typically associated with physical growth delays, characteristic facial features and mild to moderate intellectual disability.^[2] The average IQ of a young adult with Down syndrome is 50, equivalent to the mental ability of an 8- or 9-year-old child but this can vary widely.


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