The Major Novelty Of My Theory Was Its Claim That The Most Rapid Evolutionary Change Does Not Occur In Widespread, Populous Species, As Claimed By Most Geneticists, But In Small Founder Populations. - SearchQuotes

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The major novelty of my theory was its claim that the most rapid evolutionary change does not occur in widespread, populous species, as claimed by Most geneticists, but in small founder populations.

Ernst Mayr

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Indeed, I was unable to find any evidence whatsoever of the occurrence of a drastic evolutionary acceleration and genetic reconstruction in widespread, populous species.

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I had found again and again that the most aberrant population of a species - often having reached species rank, and occasionally classified even as a separate genus - occurred at a peripheral location, indeed usually at the most isolated peripheral location.

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I did not claim that speciation occurs only in founder populations.

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Evolution thus is merely contingent on certain processes articulated by Darwin: variation and selection.

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As a consequence, geneticists described evolution simply as a change in gene frequencies in populations, totally ignoring the fact that evolution consists of the two simultaneous but quite separate phenomena of adaptation and diversification.

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All I claimed was that when a drastic change occurs, it occurs in a relatively small and isolated population.

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According to the concept of transformational evolution, first clearly articulated by Lamarck, evolution consists of the gradual transformation of organisms from one condition of existence to another.

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