Frases de Theodosius Dobzhansky

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Theodosius Dobzhansky

Fecha de nacimiento: 25. Enero 1900
Fecha de muerte: 18. Diciembre 1975
Otros nombres:Theodosius Grygorovych Dobzhansky

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Theodosius Dobzhansky fue un genetista ruso, uno de los fundadores de la segunda oleada de la síntesis evolutiva moderna, junto con el zoólogo Ernst Mayr, el botánico George L. Stebbins y el paleontólogo George G. Simpson.

Dobzhansky estudió en la Universidad de Kiev y emigró a los Estados Unidos para unirse al genetista estadounidense Thomas Hunt Morgan en la Universidad de Columbia.

Sus estudios en genética de poblaciones, realizados fundamentalmente con la mosca de la fruta , le sirvieron para enunciar su famosa frase: "Nada tiene sentido en biología si no es a la luz de la evolución".

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Frases Theodosius Dobzhansky

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„The greatest evolutionist of our century.“

—  Theodosius Dobzhansky
Stephen Jay Gould, When a Fact Is Not a Fact; Awake! magazine, July 22, 1987.

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„According to Goldschmidt, all that evolution by the usual mutations—dubbed "micromutations"—can accomplish is to bring about "diversification strictly within species, usually, if not exclusively, for the sake of adaptation of the species to specific conditions within the area which it is able to occupy." New species, genera, and higher groups arise at once, by cataclysmic saltations—termed macromutations or systematic mutations—which bring about in one step a basic reconstruction of the whole organism. The role of natural selection in this process becomes "reduced to the simple alternative: immediate acceptance or rejection." A new form of life having been thus catapulted into being, the details of its structures and functions are subsequently adjusted by micromutation and selection. It is unnecessary to stress here that this theory virtually rejects evolution as this term is usually understood (to evolve means to unfold or to develop gradually), and that the systematic mutations it postulates have never been observed. It is possible to imagine a mutation so drastic that its product becomes a monster hurling itself beyond the confines of species, genus, family, or class. But in what Goldschmidt has called the "hopeful monster" the harmonious system, which any organism must necessarily possess, must be transformed at once into a radically different, but still sufficiently coherent, system to enable the monster to survive. The assumption that such a prodigy may, however rarely, walk the earth overtaxes one's credulity, even though it may be right that the existence of life in the cosmos is in itself an extremely improbable event.“

—  Theodosius Dobzhansky
Genetics and the Origin of Species (1941) 2nd revised edition

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