A type of intellectual developmental disorder called ______ is found in individuals with an extra copy of chromosome 21.

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Quizplus · Accepted Answer

Down syndrome is caused by an extra copy of chromosome 21, also known as trisomy 21. Specific learning disorder and fragile X syndrome are separate conditions not associated with an extra copy of chromosome 21. "Chromosome 21 disorder" is not a specific or recognized term for a disorder.

A Type of Intellectual Developmental Disorder Called ______ Is Found