Researchers who have analyzed the IQ scores of adopted twins have found that identical twins are more like one another in IQ than fraternal twins are.They also have found that the IQs of adopted children are more strongly correlated with the IQs of their biological parents than with the IQs of their adoptive parents.These research results suggest
A)that environment has no impact upon IQ.
B)that intelligence has a genetic component.
C)that a child's intellectual capacity is fixed at birth.
D)that a child's biological heritage predicts her lifetime patterns of achievement and accomplishment.

Question

Quizplus · Accepted Answer

The finding that identical twins are more similar in IQ than fraternal twins suggests that genetics play a role in intelligence. Additionally, the fact that adopted children's IQs are more strongly correlated with their biological parents' IQs than their adoptive parents' IQs further supports the influence of genetics. However, this does not mean that environment has no impact on IQ, as environmental factors can still affect the expression of genes related to intelligence. It also does not mean that a child's intellectual capacity is fixed at birth, as environmental factors and experiences can still influence intellectual development.

Researchers Who Have Analyzed the IQ Scores of Adopted Twins