Philosophy of Extended Evolutionary Synthesis (Part I) | Samir Okasha
Why It Matters
Clarifying that the extended synthesis is additive, not revolutionary, guides research priorities, teaching, and funding toward concrete empirical work rather than a perceived crisis.
Key Takeaways
- •Extended Evolutionary Synthesis (EES) adds concepts, not replaces Modern Synthesis.
- •Debate is polarized by caricaturing the Modern Synthesis as outdated.
- •Molecular and developmental biology already expanded the original synthesis.
- •Niche construction, epigenetics, multi-level selection enrich evolutionary theory.
- •Focus should be empirical questions, not grand revolutionary narratives.
Summary
Samir Okasha examines why the Extended Evolutionary Synthesis (EES) has become a flashpoint in evolutionary biology. He argues that the controversy stems from a caricature of the Modern Synthesis as a monolithic, outdated framework, when in fact it has already been reshaped by molecular and developmental discoveries.
Okasha notes that proponents of the EES highlight niche construction, epigenetic inheritance, and multi‑level selection as missing pieces, but these ideas merely extend, not overturn, the classic theory. He stresses that the modern synthesis, originally a 1920s‑30s integration of Darwin and Mendel, has been continuously updated, making the claim of a wholesale replacement misleading.
He quotes the field’s tendency to frame the debate in Kuhnian terms, calling it a “scientific revolution” that creates a false sense of crisis. By focusing on precise empirical questions—such as the adaptive contribution of epigenetic inheritance—research can move beyond grandiose rhetoric.
The implication is clear: evolutionary biology should treat the EES as a natural expansion of existing theory, avoiding polarizing narratives that could distort funding, curricula, and public perception.
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