When researchers try to estimate the heritability of a human behavior, what are the main kinds of individuals they consider?

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When researchers try to estimate the heritability of a human behavior, they mainly consider twins and adopted children. Twin studies involve comparing the similarity of identical twins who share 100% of their genetic material to the similarity of fraternal twins who only share 50% of their genetic material. Adopted children studies involve comparing the similarity of adopted children with their biological parents and with their adoptive parents. By comparing these groups, researchers can estimate the degree of genetic and environmental influences on a particular behavior. People from non-western cultures, newborns and infants, and uneducated people living in educated societies may also be studied for other purposes, but they are not the main focus of heritability research.

When Researchers Try to Estimate the Heritability of a Human