__________ is an inherited disorder caused by an extra 21^st chromosome that results in an intellectual disability. A) Phenylketonuria B) Huntington's disease C) Down syndrome D) Turner's syndrome

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Down syndrome is caused by having an extra copy of chromosome 21, which leads to intellectual disability, characteristic facial features, and other health problems. Phenylketonuria is a genetic disorder that affects the metabolism of the amino acid phenylalanine, Huntington's disease is caused by a genetic mutation that affects the function of brain cells, and Turner's syndrome is a genetic disorder that affects females and is caused by a missing or incomplete X chromosome.

__________ Is an Inherited Disorder Caused by an Extra 21st

__________ Is an Inherited Disorder Caused by an Extra 21^st