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LIT-749: The Major Transitions in Evolution—A Philosophy-of-Science Perspective

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StatusActive — read 2026-10-05 (NOTE-586): in full, from the publisher's open-access PDF (CC BY). Worth reading as a philosopher's map of the major evolutionary transitions. A transition is the evolution of a higher-level unit from formerly free-living ones; for it to succeed, selection between collectives must come to trump selection within them, typically through policing, kinship or division of labour. The transitions make the biological hierarchy something to be explained rather than assumed, and leave the highest occupied level privileged as the level of organisms. Limits: a review with no model or data, provisional by its own account; it cautions that general principles may explain each transition only coarsely. It stands in for the unread 2005 paper LIT-721.
Tagsphilosophy-of-biology, philosophy-of-science, individuation
ExtendsLIT-721 — Multilevel Selection and the Major Transitions in Evolution
Cited as “paper” byNOTE-586 — The Major Transitions in Evolution—A Philosophy-of-Science Perspective
Cited as “source” byTHEORY-141 — In a major evolutionary transition, where formerly free-living units come to form a higher-level unit, the collective is stable only if selection between collectives comes to trump selection among the units within them, typically through mechanisms such as policing, kinship and division of labour that align the interests of the units; the levels at which selection acts are then a product of evolution, to be explained rather than assumed

Graph View

Samir Okasha (2022), Frontiers in Ecology and Evolution 10:793824 — DOI-10.3389/fevo.2022.793824

Key takeaways

  • What a transition is (p. 2). Okasha defines it as “the evolution of a higher-level biological unit out of formerly-free living units”, setting aside the genetic code, DNA, sex and language from Maynard Smith and Szathmáry’s list.
  • Not inevitable (p. 3). Transitions may be “rare singularities”, and intermediate levels of cooperation may be stable rather than staging posts.
  • General principles, coarse explanations (pp. 3–4). A collective needs a short-term advantage to form; it may be destabilised by defectors; kinship, policing and division of labour can align the units’ interests; and higher-level selection must trump lower-level selection. These are relevant to all transitions, but “relevant” is not “explanatorily fundamental”, and over-applying social-evolution concepts such as “cheating” has done harm (Rainey et al. 2014).
  • Genic and hierarchical approaches (pp. 4–5) are “something of a false dichotomy”, and formal equivalence between multilevel and inclusive-fitness models is not causal-explanatory equivalence.
  • The hierarchy is to be explained (pp. 5–6). The traditional levels of selection debate took the hierarchy as given (citing his 2005 paper); in the transitions it “moves from being part of the explanans to being part of the explanandum”. Given that transitions occurred, the importance of multi-level selection “can hardly be denied”.
  • A privileged level (pp. 7–9). A transition shifts the level of organismality, and the highest occupied level is privileged as where organisms are. Okasha weighs three ways of handling organisms within organisms and finds none decisive.

Standing in the record

Filed on 2026-10-05 at the owner’s request, as a supplement to the essay on organizational will, and as the substitute for Okasha’s 2005 paper (LIT-721), which it cites for the two-level view of transitions and for the point that the traditional debate set aside the origin of the hierarchy. It restates that point and builds on it, so it is declared as extending the 2005 paper. Aktipis et al. (LIT-740) apply its general principle to multicellularity. The account is THEORY-141.

It bears on the essay’s §6.3: capture from below is what a transition must overcome, and policing is one way. The record also reads the hierarchy-as-explanandum point as bearing on §6.2: the levels an organization’s members depend on are produced, not given. Okasha does not discuss organizations.

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