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Mention the causes of Down's syndrome an...

 Mention the causes of Down's syndrome and add a note on symptoms.

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The presence of an additional autosome in The 21st part (trisomy of 21st pair) is responsible for Down.s syndrome. Symptoms include (a) Short statured body with small roundhead.
(b) Furrowed tongue
(c) Partially open mouth
(d) Palm is broad with characteristic Crease
(e) Physical, psychomotor and mental
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