Researchers who examine the heritability of personality traits using the twin-study method would probably begin with the assumption that

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Researchers using the twin-study method to examine the heritability of personality traits typically start with the assumption that both monozygotic (identical) and dizygotic (fraternal) twins share environments that are equally similar. This assumption allows them to attribute differences in traits more directly to genetics, as the environmental variable is considered constant between the two types of twins.

Researchers Who Examine the Heritability of Personality Traits Using the Twin-Study