Down syndrome: Most have intellectual disabilities in the mild to moderate range ( iq 50-70 to iq 35-50 ), speech delays, fine motor skills are delayed, epilepsy & alzheimers disease likely later on.
Answered 12/9/2013
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Multiple: The extra chromosome in every cell is like having too many instructions to put together a functioning project. So every brain cell will be a bit off in function, leading to reduced intellectual potential.Related heart defects and medical issues can result in so much hospitalization or time away from school that they fall further behind in development.
Answered 6/29/2018
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