Dobzhansky, Theodosius (dôbzhän`skē), 1900–1975, American geneticist, b. Russia, grad. Univ. of Kiev, 1921. He emigrated to the United States in 1927 and was naturalized in 1937. Dobzhansky taught at the California Institute of Technology (1930–40) and was professor of zoology at Columbia (1940–62), leaving to become associated with the Rockefeller Institute (now Rockefeller Univ.). He conducted much research with Drosophila and is known for his basic work in genetics. His writings are of considerable significance and include Genetics and the Origin of Species (1937, 3d ed. 1951), a challenging summation of contemporary knowledge of genetics; Evolution, Genetics, and Man (1955); and Mankind Evolving: The Evolution of the Human Species (1962), which with great wisdom deals with cultural as well as biological evolution.

Bibliography

See also Genetics of the Evolution Process (1970) and Genetic Diversity and Human Equality (1973).

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 Institute of Technology, Columbia University, and Rockefeller University. He laid the groundwork for a theory combining Darwinian evolution and Mendelian genetics by changing the then commonly held view that natural selection produced something close to the best of all possible results and that changes would be rare and slow and not apparent over one life span. He observed extensive genetic variability in wild populations of Drosophila, and he found that in a given population some genes would regularly change in abundance with the seasons of the year.

Dobzhansky, Theodosius (Grigorievich) (1900–75) geneticist; born in Nemirov, Ukraine. He taught zoology in Russia, and emigrated to the U.S.A. (1927) because of Stalinist repression of genetic science. He was a professor and researcher at the California Institute of Technology (1928–40), where he published his seminal book, Genetics and the Origin of Species (1937). He relocated to Columbia University (1940–62), joined Rockefeller University (1962–71), then moved to the University of California: Davis (1971–75). He demonstrated that the genetic variability in a population is large, including many potentially lethal genes that nevertheless confer versatility when the population is exposed to environmental change. A prolific and internationally acclaimed writer, his work on population evolution in both fruit flies and humans gave the experimental evidence that linked Darwinian theory with Mendel's law of heredity.