Which method assesses hereditary influence by examining resemblance between adopted children and both their biological and adoptive parents?

Which method assesses hereditary influence by examining resemblance between adopted children and both their biological and adoptive parents?

• A. Twin studies
• B. Family studies
• C. Adoption studies
• D. Case studies

Answer: (C)

Adoption studies assess hereditary influence by examining how adopted children resemble their biological parents (sharing genes) and their adoptive parents (sharing environment). If a child’s traits or outcomes align more with biological parents, that points to a genetic contribution; if they align more with adoptive parents, that points to environmental influence. This design directly separates nature from nurture by using children raised away from their biological parents, letting the comparison highlight genetic effects independent of upbringing. Other methods mix genetic and environmental factors in various ways: twin studies compare similarities between identical and fraternal twins but don’t provide the direct contrast between genetic relatives and adoptive relatives; family studies look at relatives across generations but can’t cleanly separate shared genetics from shared family environments; case studies focus on detailed observations of individuals without a comparative design to parse heredity versus environment.

Adoption studies assess hereditary influence by examining how adopted children resemble their biological parents (sharing genes) and their adoptive parents (sharing environment). If a child’s traits or outcomes align more with biological parents, that points to a genetic contribution; if they align more with adoptive parents, that points to environmental influence. This design directly separates nature from nurture by using children raised away from their biological parents, letting the comparison highlight genetic effects independent of upbringing. Other methods mix genetic and environmental factors in various ways: twin studies compare similarities between identical and fraternal twins but don’t provide the direct contrast between genetic relatives and adoptive relatives; family studies look at relatives across generations but can’t cleanly separate shared genetics from shared family environments; case studies focus on detailed observations of individuals without a comparative design to parse heredity versus environment.