different between hereditarianism vs hereditarian

English

hereditarian +? -ism

hereditarianism (uncountable)

The school of thought that heredity is more important than factors such as environment in determining intelligence and behaviour.

From hereditary +? -an.

hereditarian (plural hereditarians)

hereditarian (comparative more hereditarian, superlative most hereditarian)

Pertaining to hereditarianism.
- 1999, Matt Ridley, Genome, Harper Perennial 2004, p. 293:
  When it reported in 1908, it took a strongly hereditarian view of mental deficiency, which was not surprising given that many of its members were paid-up eugenists.

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