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

Name: __________ is an inherited disorder caused by an extra 21 st chromosome that results in mental retardation. A)Phenylketonuria B)Huntington's disease C)Down syndrome D)Turner's syndrome
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Down syndrome is also known as Trisomy 21 because a person with the disorder has three 21^st chromosomes instead of two.

__________ Is an Inherited Disorder Caused by an Extra 21st

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