Get your Facts Down!
"Down syndrome occurs when an individual has a full or partial extra copy of chromosome 21. This additional genetic material alters the course of development and causes the characteristics associated with Down syndrome."
Down
syndrome occurs when an individual has a full or partial extra copy of
chromosome 21. This additional genetic material alters the course of
development and causes the characteristics associated with Down
syndrome. - See more at:
http://www.ndss.org/Down-Syndrome/Down-Syndrome-Facts/#sthash.erf5bsC0.dpuf
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