Controversy in Evolutionary Theory: A multilevel view of the issues
A conflict exists between field biologists and physiologists ("functional biologists" or "evolutionary ecologists") on the one hand and those working in molecular evolution ("evolutionary biologists" or "population geneticists") on the other concerns the relative importance of natural selection and genetic drift. This paper is concerned with this issue in the case of vertebrates such as birds, fishes, mammals, and specifically humans, and views the issue in that context from a multilevel perspective. It proposes that the resolution is that adaptive selection outcomes occurring at the organism level chain down to determine outcomes at the genome level. The multiple realizability of higher level processes at lower levels then causes the adaptive nature of such processes at the organism level to be largely hidden at the genomic level. The discussion is further related to the "negative view" of selection, the Evo-Devo and Extended Evolutionary Synthesis views, and the levels of selection debate, where processes at the population level can also chain down in a similar way
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