One method used to study behavioural genetics is twin studies. This allows researchers to obtain estimates of how heritable personality traits are. If a trait is genetically influenced,

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If a trait is genetically influenced, identical twins should be more similar on that trait than fraternal twins. This is because identical twins share 100% of their genetic material, while fraternal twins share 50% on average. Therefore, any differences in the similarity of the trait between identical and fraternal twins can be attributed to genetic factors.

One Method Used to Study Behavioural Genetics Is Twin Studies