A condition of mild to severe intellectual disability caused by an extra copy of chromosome 21 is known as

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Down syndrome is a genetic disorder caused by the presence of an extra copy of chromosome 21. It is characterized by varying degrees of intellectual disability, distinctive facial features, and other physical abnormalities. Autism spectrum disorder (A) is a neurodevelopmental disorder characterized by impaired social interaction, communication deficits, and restricted, repetitive patterns of behavior. Crystallized intelligence (B) refers to the ability to use knowledge acquired through experience and education. Savant syndrome (D) refers to a rare condition in which a person with intellectual disability exhibits exceptional skills or abilities in a specific area, such as music, art, or math. None of these options describe the specific condition caused by an extra copy of chromosome 21, so C is the best answer.

A Condition of Mild to Severe Intellectual Disability Caused by an Extra