Module 63-1

Heritability relates to the

• percentage of a person’s intelligence that is due to environmental influences.

• percentage of a person’s intelligence that is due to genetics.

• correlation of intelligence test scores among family members.

• extent to which variability among individuals’ intelligence scores can be attributed to genetic variation

The correlation between the IQ scores of fraternal twins raised together is lower than IQ scores of identical twins raised together. What conclusion can be drawn from this data?

• There is a genetic effect on intelligence.

• There is an environmental effect on intelligence.