Dob·zhan·sky 
(dŭb-zhănskē), Theodosius Grigorevich 1900-1975.
(dŭb-zhănskē), Theodosius Grigorevich 1900-1975. Russian-born American biologist whose synthesis of population genetics with natural history in Genetics and the Origin of Species (1937), based on his studies of fruit flies in the wild, is considered a milestone in the development of modern evolutionary biology.
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