Which method is NOT valid to study the role of heredity?

Correct option is D

Peer group study is not a valid method for studying heredity, as peers are typically unrelated biologically. Studies of heredity rely on methods like twin studies, parent-child analysis, and adoption studies to distinguish genetic influences from environmental factors.
Information Booster:
· Twin studies compare identical (monozygotic) and fraternal (dizygotic) twins to assess genetic versus environmental contributions.
· Parent-child analysis examines inheritance patterns across generations.
· Adoption studies isolate environmental influences by comparing adopted children with their biological and adoptive parents.
· Peer groups influence behavior but do not reflect genetic factors.
Additional Knowledge:
· Twin study: Best for distinguishing genetic and environmental influences due to shared DNA in identical twins.
· Parent-Child analysis: Identifies heritable traits and familial patterns.
· Adoption study: Helps differentiate inherited traits from environmental upbringing.