The belief or theory that human traits, abilities, and behaviors are primarily determined by inherited genetic factors.
From 'hereditarian' plus '-ism' suffix indicating a system of beliefs. Developed as scientific and social theory became more sophisticated in the 19th century.
Hereditarianism became dangerously influential in early 20th-century eugenics movements, showing how scientific-sounding theories can justify terrible policies if we ignore the role of environment and opportunity.
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