Quote:
Originally Posted by 79CamaroDiva
this isnt something from the intra web.. its from high school.. might actually have to look in a :gasp: book for it.
down's syndrome is caused by an extra chromosome.. by having 47 instead of 46. you probably should have googled that too.
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i know that, it's trisomy (or 3) of chromosome 21.
and you've just repeated what i said? except mine was the origins and yours was the result