Darwin’s theory of natural selection, to be valid, required explanations for both the origin of variation and for the inheritance of variants. John Maynard Smith explains Lamarck’s theory of the inheritance of acquired characteristics (in which Darwin believed), Weismann’s theory of separate inheritance lines of germ and soma, Mendel’s experiments and explanations, and the discovery of the role of DNA in the transmission of genetic information. (26 minutes)

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Part of the Series : The Evolution of Darwin

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