The Source of Intelligence

Critical Thinking Questions

What evidence exists for a genetic component to an individual’s IQ?


Twin studies are one strong indication that IQ has a genetic component. Another indication is anecdotal evidence in the form of stories about highly intelligent individuals who come from difficult backgrounds yet still become highly successful adults.

Describe the relationship between learning disabilities and intellectual disabilities to intelligence.


Learning disabilities are specific neurological problems within the brain and are separate from intelligence. Intellectual disabilities are pervasive and related to intelligence.