What is the Role of Drift in Evolution? II. Protein Variation
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By the mid 1960s it seemed that the controversy over the role of drift had largely abated. The view of Wright, that at a large proportion of loci the effects of natural selection and drift are roughly comparable in magnitude, was tentatively rejected by most population geneticists in favour of the view of Fisher and Ford, who argued that the effects of natural selection would dominate those of drift under most circum- stances. This, then, was the age of “naive pan-selectionism” (Kimura and Ohta 1971) or “hyperselectionism” (Dobzhansky 1970). We have tried in the preceding chapter to explain how this attitude came about as a result of studies on morphological characters, and have indeed argued that in respect of such characters the strongly selectionist view best meets the evidence available.
KeywordsNatural Selection Genotype Frequency Nucleotide Substitution Effective Population Size Amino Acid Site
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