Most studies examining possible genetic influences on human intelligence examine?

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Most studies examining possible genetic influences on human intelligence focus on comparing the IQ scores of identical twins (who share 100% of their DNA) raised separately or together and fraternal twins (who share approximately 50% of their DNA) raised separately or together. Adopted children may also be included in these studies to compare their IQ scores with those of their biological and adoptive parents. This approach allows researchers to estimate the heritability of intelligence, which is the extent to which genetic factors contribute to individual differences in intelligence.

Most Studies Examining Possible Genetic Influences on Human Intelligence Examine