modern evolutionary synthesis

Compiled with AI assistance and selectively reviewed. Please consult the cited passages; the books remain the authoritative source. About this companion

Editorial synthesis · provisional

Definition

The Modern Evolutionary Synthesis is the population-genetic integration of Mendelian inheritance with Darwinian natural selection presented in the corpus as a major evolutionary framework. Mutation and recombination supply heritable variation on which selection can act. The author places later developmental and reciprocal-causation debates beside it, while retaining selection’s central role and distinguishing random variation relative to adaptive need from equal probability of every possible phenotype.

Explanation

RB1 names the historical integration through Dobzhansky, Huxley and Mayr in its native apparatus. The framework organizes inheritance, variation and population-level change; it is not simply the claim that organisms deliberately acquire whatever traits they need. The proposal preserves its historical identity rather than calling every later account of evolution a version of the same synthesis.

The discussion includes criticism associated with Rose and Oakley, which remains a named position rather than anonymous biological consensus. RB1’s subsequent Extended Synthesis account explicitly retains natural selection and notes controversy over whether a new framework is required. Developmental expansion therefore does not become an authorial rejection of Darwinian mechanisms.

The developmental-bias passage explains that available phenotypic variants need not be equally likely. Regulatory changes and developmental organization help shape what variation appears before selection acts. This is compatible with Darwinian selection and limits a misleading reading of random variation as an equiprobable draw from every conceivable form.

Scope and attribution

Keep the historical framework, attributed criticisms and continuing selection role separate.

RB1 — The Real Book, Volume I: The Possible Is Real

The historical synthesis, attributed criticisms and later developmental qualifications remain distinct.

Occurrence locators: 145, 146, 147, 148, 149, 150, 151.

Background used in the editorial explanation

Named theories and mechanisms are distinguished from neighboring background, homonyms and the author’s own synthesis. Reproduced AI passages retain their separate voice.