Bryan Caplan on Parenting
EconTalk
00:00
How twin studies work. It's relatively simple.
The comparison of identical and fraternal twins reveals insights into the genetic and environmental contributions to similarity in outcomes. A strong correlation between identical twins compared to fraternal twins suggests a genetic basis for traits. However, if the increase in genetic similarity does not significantly boost correlation, it indicates that environmental factors, or nurture, play a substantial role. Specifically, minimal increases in correlation despite genetic similarity point to the importance of parental influence and nurture in shaping individual outcomes.
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