Samir Okasha's Evolution and the Levels of Selection PDF

By Samir Okasha

ISBN-10: 0199267979

ISBN-13: 9780199267972

ISBN-10: 0199556717

ISBN-13: 9780199556717

ISBN-10: 1435622669

ISBN-13: 9781435622661

Does normal choice act totally on person organisms, on teams, on genes, or on entire species? Samir Okasha offers a finished research of the talk in evolutionary biology over the degrees of choice, concentrating on conceptual, philosophical and foundational questions. a scientific framework is constructed for puzzling over traditional choice performing at a number of degrees of the organic hierarchy; the framework is then used to aid unravel amazing matters. massive realization is paid to the idea that of causality because it pertains to the degrees of choice, specifically the concept that average choice at one hierarchical point could have results that 'filter' up or all the way down to different degrees. in contrast to past paintings during this quarter through philosophers of technological know-how, complete account is taken of the hot organic literature on 'major evolutionary transitions' and the new resurgence of curiosity in multi-level choice idea between biologists. different organic subject matters mentioned contain Price's equation, relatives and team choice, the gene's eye view, evolutionary online game idea, outlaws and egocentric genetic components, species and clade choice, and the evolution of individuality. Philosophical subject matters mentioned comprise reductionism and holism, causation and correlation, the character of hierarchical association, and realism and pluralism.

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Extra resources for Evolution and the Levels of Selection

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The level of selection is simply the hierarchical level occupied by the entities that are units of selection. Thus we can translate easily between talks of units and levels. Note that this convention contrasts with the usage of Brandon (1988), who uses the unit/level distinction in lieu of the replicator/interactor distinction. It also contrasts with the usage of Reeve and Keller (1999), who regard the ‘units of selection’ question as stale but the ‘levels of selection’ question as empirically exciting.

Viability selection leads the value of z to change within the P-population, between times t1 and t2 ; the magnitude of this change is given by Cov (ω, z). The surviving entities then reproduce, leading to a further change between times t2 and t3 , of magnitude Ew ( z). So under pure viability selection, Cov (ω, z) equals the within-generation change in z, while Ew ( z) equals the subsequent change that happens during the process of reproduction. But if there is a component of fecundity selection, this interpretation fails.

Such requirements mistake a product of Darwinian evolution for a prerequisite of it. This is a consideration in favour of the abstract Lewontin characterization. The expressions ‘unit of selection’ and ‘level of selection’ have engendered certain confusion. The following convention will be observed here: if entities at hierarchical level X are units of selection in the Lewontin sense, I shall say that selection ‘operates at level X’. The level of selection is simply the hierarchical level occupied by the entities that are units of selection.

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Evolution and the Levels of Selection by Samir Okasha


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