EVOLVING CONCEPTS. “The susceptibility of hereditary mechanisms to biological influences was a matter of intense debate in the late 18th and 19th centuries. With the twin triumphs of Mechanism over Vitalism and Darwinism over Lamarckism in the first half of the 20th century, the Weismann idea of the segregated germ plasm directing the actions of the cell and organism in a hard-wired fashion has been the prevailing view.”
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