In the 1920 and how did dobzhansky and Mayr explain the origins of species?

In the 1920s, geneticist Theodosius Dobzhansky and evolutionary biologist Ernst Mayr contributed significantly to the modern synthesis of evolutionary theory by integrating Mendelian genetics with Darwinian evolution. Dobzhansky emphasized the role of genetic variation and natural selection in driving speciation, while Mayr introduced the concept of biological species as groups of interbreeding natural populations that are reproductively isolated from other such groups. Together, they argued that species originate through gradual changes in populations over time, influenced by genetic drift, mutation, and environmental pressures. Their work laid the foundation for understanding evolution as a process that combines genetic mechanisms with ecological dynamics.