It is a chromosomal disorder caused by an extra 21st chromosone. The condition is characterised by a combination of major and minor differences in structure. Oftne Down Syndrome is associated with some impairment of the mental/Cognitive ability and physical growth as well as facial appearence.
The incidence of Down Syndrome istimated at 1 per 800-1000 births, although these statistics are heavily influenced by the age of the mother.
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