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What causes Down's syndrome? What are the symptoms?

colleen

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12 years ago

What causes Down's syndrome? What are the symptoms?

What causes Down's syndrome? What are the symptoms?

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ThePsychic

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#1

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12 years ago

It is caused by an extra 21st chromosome fragment. The disorder involves impairment in both psychomotor and physical development, as well as mental retardation.

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