Adoption studies show that the average correlation for personality variables between adopted siblings who share much of their environment,but who share no genes,is _____.

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Adoption studies typically find that the average correlation for personality variables between adopted siblings, who share their environment but not their genes, is very low, around .05. This suggests that genetic factors play a significant role in personality, as these siblings do not share genetic material but do share environmental factors.

Adoption Studies Show That the Average Correlation for Personality Variables