“Although random mutations influenced the course of evolution, their influence was mainly by loss, alteration, and refinement… Never, however, did that one mutation make a wing, a fruit, a woody stem, or a claw appear. Mutations, in summary, tend to induce sickness, death, or deficiencies. No evidence in the vast literature of heredity changes shows unambiguous evidence that random mutation itself, even with geographical isolation of populations, leads to speciation.”

Source: Acquiring Genomes: A Theory Of The Origin Of Species

Last update June 3, 2021. History

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Lynn Margulis 24
American evolutionary biologist 1938–2011

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