What is the study of the relative power and limits of genetic and environmental influences on behavior?

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Behavior genetics is the study of the relative power and limits of genetic and environmental influences on behavior. It asks how much of the variation in a trait across individuals is due to genes versus the environment, often using twin and adoption studies to estimate heritability. This field emphasizes that both nature and nurture shape behavior and that the same genetic makeup can lead to different outcomes depending on the environment. It differs from neuropsychology (brain–behavior relationships), cognitive psychology (thinking and mental processes), and sociobiology (evolutionary explanations for social behavior).