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Modern Evolutionary Synthesis

The Modern Evolutionary Synthesis is the landmark intellectual unification achieved in the 1930s and 1940s that reconciled Darwin's theory of natural selection with Mendelian genetics, population genetics, paleontology, systematics, and biogeography into a single coherent evolutionary framework.

Type: Event Domain: Biology Mathematics Era: 1930 — 1947

Overview

Before the Synthesis, geneticists studying discrete heritable traits and naturalists observing gradual change in wild populations appeared to describe incompatible phenomena. Key architects — Ronald Fisher, Sewall Wright, and J.B.S. Haldane, who provided mathematical foundations; Theodosius Dobzhansky, who bridged laboratory and field biology; Ernst Mayr, who contributed a rigorous biological species concept; and George Gaylord Simpson, who integrated the fossil record — demonstrated that Mendelian inheritance operating through allele frequency changes is precisely the mechanism through which Darwinian selection acts over time.

Why it matters

The Synthesis transformed evolutionary biology from a descriptive, historically fragmented discipline into a mathematically grounded, unified science, profoundly shaping every branch of the life sciences for the remainder of the twentieth century. It also shaped philosophy of science by exemplifying how disparate empirical traditions can be unified under shared formal principles, influencing debates about reduction and explanation in biology.

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