Online research in philosophy

This book is concerned with, and makes an important contribution to, answering the central question of evolutionary theory: By what mechanisms and processes do organisms undergo transformative change? Animals or plants may undergo alterations in morphology or activity during their lifetimes, but only if such alterations are conveyed to the next generation can they contribute to the establishment of new forms. Heritability by itself is not decisive: offspring can differ from their parents at a variety of genetic loci without this (...) constituting evolutionary change, notwithstanding the fact that on theoretical grounds the standard model, stemming from the Modern Synthesis, asserts that any such variation represents incipient evolution (i.e., evolution is change in allele frequency). Clearly, some gene changes make more of an evolutionary difference than others. By placing phenotype at center stage and treating genotypes not in terms of their selective advantage, but rather with respect to the changes they exert on the phenotype, the author subtly but significantly reorients the explanatory terrain of evolutionary theory. (shrink)