A condition of mild to severe intellectual disability caused by an extra copy of chromosome 21 is known as
A) fluid intelligence.
B) crystallized intelligence.
C) Down syndrome.
D) the Flynn effect.

Question

Quizplus · Accepted Answer

Down syndrome is caused by an extra copy of chromosome 21, leading to mild to severe intellectual disability. Fluid intelligence and crystallized intelligence refer to different aspects of intelligence and are not related to Down syndrome. The Flynn effect refers to the observed increase in average intelligence scores over time, and is also unrelated to Down syndrome.

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