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Minnesota Study of Twins Reared Apart: Intelligence Findings
The Minnesota Study of Twins Reared Apart provided evidence for a genetic component to intelligence. The investigation revealed that identical twins, whether raised together or apart, exhibit a higher correlation between their IQ scores than siblings or fraternal twins who are raised together.
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IQ Correlation and Genetic Relatedness
A large-scale study tracks pairs of siblings and measures the similarity of their intelligence scores, expressed as a correlation coefficient (where a higher value means more similarity). The results for three distinct groups are summarized below:
Group IQ Score Correlation Identical Twins (reared in separate homes) 0.76 Fraternal Twins (reared in the same home) 0.58 Adopted Siblings (reared in the same home) 0.29 Based only on the data in this table, which of the following is the most valid conclusion?
Heritable Personality Traits Identified in Twin Studies
Minnesota Study of Twins Reared Apart: Intelligence Findings