Theodosius Dobzhansky

Theodosius Dobzhansky was a Ukrainian-American geneticist and evolutionary biologist whose research on fruit flies and writings helped unite Mendelian genetics with Darwinian evolution.

Modern synthesis: A framework integrating Darwinian evolution with Mendelian genetics and other biological disciplines. Dobzhansky’s 1937 book helped establish this framework by explaining evolution through genetic changes in populations.
Drosophila pseudoobscura: A fruit fly species widely used in genetic and evolutionary research. Dobzhansky used this species to track chromosome arrangements across natural populations.
Thomas Hunt Morgan: An American geneticist whose fruit-fly experiments established the chromosome theory of inheritance. Dobzhansky trained in Morgan’s laboratory and carried its genetics into evolutionary research.
Genetics and the Origin of Species: Dobzhansky’s 1937 book connecting Mendelian genetics, population variation, and Darwinian evolution. This book made his synthesis of genetics and evolution a foundation for later biological work.
Mendelian inheritance: The transmission of discrete hereditary factors from parents to offspring, described by Mendel’s laws. Its laws supplied the inheritance rules that Dobzhansky connected to evolutionary change.
Chromosomal inversion: A chromosome rearrangement in which a segment breaks, reverses orientation, and rejoins. Inversions let Dobzhansky measure genetic differences and evolutionary patterns in wild fruit flies.
Sewall Wright: An American geneticist who developed influential theories of genetic drift, selection, and population structure. Wright’s population-genetic ideas shaped Dobzhansky’s interpretation of variation in nature.
Nothing in Biology Makes Sense Except in the Light of Evolution: A 1973 essay by Dobzhansky arguing that evolution provides biology’s unifying framework. The essay distilled his scientific and humanist case for evolution’s central place in biology.
Population genetics: The study of genetic variation within populations and how evolutionary forces change it. This field provided the mathematical language for Dobzhansky’s account of evolution.
Dobzhansky–Muller model: An explanation of how incompatible genetic changes can accumulate in separate populations and contribute to reproductive isolation. The model carries Dobzhansky’s name and connects genetic divergence to the origin of species.

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