What have been the main methods that have commonly been employed by psychologists to investigate the genetic basis of personality?

Question

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Twin studies and adoption studies have been primary methods used by psychologists to understand the genetic basis of personality. Twin studies allow researchers to compare the similarities between identical twins (who share 100% of their genes) and fraternal twins (who share about 50% of their genes), while adoption studies compare adopted children to their biological and adoptive parents to distinguish the effects of environment from genetics.

What Have Been the Main Methods That Have Commonly Been