Dobzhansky , Theodosius
(1900–1975) Russian–American geneticist
Dobzhansky, who was born in Nemirov, in Ukraine, graduated in zoology from Kiev University in 1921; he remained there to teach zoology before moving to Leningrad, where he taught genetics. In 1927 he took up a fellowship at Columbia University, New York, where he worked with T.H. Morgan. Morgan was impressed by Dobzhansky's ability and, when the fellowship was completed, offered him a teaching post at the California Institute of Technology. Dobzhansky accepted and became an American citizen in 1937.
Dobzhansky studied the fruit fly (Drosophila) and demonstrated that the genetic variability within populations was far greater than had been imagined. The high frequency of potentially deleterious genes had previously been overlooked because their effects are masked by corresponding dominant genes. Dobzhansky found that such debilitating genes actually conferred an advantage to the organism when present with the normal type of gene, and therefore they tended to be maintained at a high level in the population. Populations with a high genetic load – i.e. many concealed lethal genes – proved to be more versatile in changing environments. This work profoundly influenced the theories on the mathematics of evolution and natural selection with regard to Mendelism.
In addition, Dobzhansky wrote many influential books, includingGenetics and the Origin of Species (1937), a milestone in evolutionary genetics.

Scientists. . 2011.

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  • Dobzhansky, Theodosius — orig. Feodosy Grigorevich Dobrzhansky born Jan. 25, 1900, Nemirov, Ukr., Russian Empire died Dec. 18, 1975, Davis, Calif., U.S. Ukrainian born U.S. geneticist and evolutionist. He immigrated in 1927 to the U.S., where he taught at the California… …   Universalium

  • Dobzhansky, Theodosius — orig. Feodosy Grigorevich Dobrzhansky (25 ene. 1900, Nemirov, Ucrania, Imperio ruso–18 dic. 1975, Davis, Cal., EE.UU.). Genetista y evolucionista estadounidense nacido en Ucrania. En 1927 emigró a EE.UU., donde enseñó en el Instituto Tecnológico… …   Enciclopedia Universal

  • Theodosius Dobzhansky — (en ucraniano: Феодосій Григорович Добржанський) (25 de enero de 1900, Nemirov, URSS (actualmente Ucrania) 18 de diciembre de 1975, San Jacinto (California)) fue un genetista soviético, uno de los fundadores de la Teoría Sintética de la Evolución …   Wikipedia Español

  • Dobzhansky — Theodosius Dobzhansky (russisch Феодосий Григорьевич Добржанский/Feodossi Grigorjewitsch Dobrschanski; * 24. Januar 1900 in Nemirow; † 18. Dezember 1975 in San Jacinto) war ein russisch US amerikanischer Genetiker, Zoologe und Evolutionsbiologe,… …   Deutsch Wikipedia

  • Theodosius — ist unter anderem der Name dreier römischer bzw. byzantinischer Kaiser: Theodosius I., der Große (347–395, oströmischer Kaiser, letzter Kaiser des Gesamtreiches), Theodosius II. (401–450, oströmischer Kaiser), Theodosius III. (715–717,… …   Deutsch Wikipedia

  • Theodosius Dobzhansky — This name uses Eastern Slavic naming customs; the patronymic is Grygorovych and the family name is Dobzhansky. Theodosius Dobzhansky …   Wikipedia

  • Theodosius — (as used in expressions) Dobzhansky Theodosius Theodosius I Flavius Theodosius Theodosius the Great Theodosius I Boradiotes Theodosius II Theodosius of Alexandria * * * …   Universalium

  • Theodosius Dobzhansky — (russisch Феодосий Григорьевич Добржанский/Feodossi Grigorjewitsch Dobrschanski; * 24. Januar 1900 in Nemirow; † 18. Dezember 1975 in San Jacinto) war ein russisch US amerikanischer Genetiker, Zoologe und Evolutionsbiologe, der zusammen mit… …   Deutsch Wikipedia

  • Theodosius — (from the Greek Θεοδόσιος , Giver of God ) is a name which might refer to one of several people:* One of three emperors of ancient Rome and Byzantium: ** Theodosius I (347 ndash;395; Theodosius the Great ), son of Count Theodosius ** Theodosius… …   Wikipedia

  • Theodosius Dobzhansky — genetista ucraniano (1900,1975), estudió en la Universidad de Kiev y emigró a los Estados Unidos para unirse al zoólogo estadounidense Thomas Hunt Morgan en la Universidad de Columbia. Sus estudios sobre genética de poblaciones, realizados… …   Enciclopedia Universal

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