Download Progress and Prospects in Evolutionary Biology: The by Jeffrey R. Powell PDF

By Jeffrey R. Powell

This publication makes a speciality of drosophila as an extremely invaluable version organism for exploring questions of evolutionary biology within the complete diversity of evolutionary experiences: inhabitants genetics, ecology, ecological genetics, speciation, phylogenetics, genome evolution, molecular evolution, and improvement. the writer offers an built-in view of evolutionary biology as elucidated during this unmarried organism. distinct attempt is made to indicate holes in our wisdom and parts really ripe for brand spanking new research.

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Additional info for Progress and Prospects in Evolutionary Biology: The Drosophila Model (Oxford Series in Ecology & Evolution)

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This is not surprising considering the very different ecologies and population histories experienced by different Drosophila species. On the face of it, it would seem that the classical/balance conflict had been resolved in favor of the balance view. As predicted most boldly by Wallace (1959), it would appear that no individual is homozygous, that is, there is no true wild type. Knowing the limitations of protein electrophoresis, it is likely that nearly all loci are polymorphic—a prediction confirmed by more recent DNA studies (see next section and chapter 10).

These include such traits as body weight, wing length, ovariole number, egg production, alcohol tolerance, temperature tolerance, desiccation resistance, oviposition rhythm, light sensitivity, and sexual behavior. David et al. (1983) can be consulted for details and guides to the literature. The Molecular Basis of Polygenic Variation The actual molecular basis of quantitative variation in Drosophila is not well understood. Mukai and Cockerham (1977) concluded that mutations in structural loci (loci coding for proteins) were unlikely to be the basis for polygenic viability effects.

Lewontin (and many others at the time) believed this epistemological paradox could be overcome by the application of molecular technologies. Twenty years after Lewontin's book, this has not yet been fully achieved. I will, however, argue in subsequent chapters that for the first time in nearly a hundred years, evolutionary genetics is beginning to move beyond the preoccupation with the fundamental dichotomy epitomized by the classical and balance views. It is not that the issue has been unambiguously resolved by evidence convincing to all practitioners.

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