In addition to research using parent ratings, adoption research has also supported the notion that temperaments are genetically influenced.

Question

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Adoption studies, which compare similarities between adopted children and their biological and adoptive parents, have found that there are significant correlations between the temperaments of biological parents and their children, even when the children are raised in different environments. This supports the idea that genetics play a significant role in determining temperament.

In Addition to Research Using Parent Ratings, Adoption Research Has