To examine genetic influences on criminal behavior, researchers often rely on ________ studies comparing identical and fraternal twins.

To examine genetic influences on criminal behavior, researchers often rely on ________ studies comparing identical and fraternal twins.

• A. Experimental studies
• B. Twin studies
• C. Longitudinal studies
• D. Cross-sectional surveys

Answer: (B)

Twin studies are used to examine genetic influences on criminal behavior by comparing identical twins who share nearly all their genes with fraternal twins who share about half. If genetics contribute to crime, identical twins should show higher concordance for criminal behavior than fraternal twins, because they have far more genetic similarity. This approach lets researchers estimate heritability by looking at how similarly twins behave, while often assuming they experience similar environments. Other study designs can reveal associations but don’t separate genetic from environmental influences as directly as comparing identical and fraternal twins.

Twin studies are used to examine genetic influences on criminal behavior by comparing identical twins who share nearly all their genes with fraternal twins who share about half. If genetics contribute to crime, identical twins should show higher concordance for criminal behavior than fraternal twins, because they have far more genetic similarity. This approach lets researchers estimate heritability by looking at how similarly twins behave, while often assuming they experience similar environments. Other study designs can reveal associations but don’t separate genetic from environmental influences as directly as comparing identical and fraternal twins.