Philosophy of Science 45 (1):96-109 (1978)
These days 'evolution' is usually defined as any change in the relative frequencies of genes in a population over time. This definition and some obvious alternatives are examined and rejected. The criticism of these definitions points out the need for a more holistic analysis of genotypes. I attempt such analysis by introducing measures of similarity of whole genotypes and then by grouping genotypes into similarity classes. Three sorts of measures of similarity are examined: a measure of structural similarity, a measure of functional similarity and one of relational or historical similarity. The functional approach is shown to be superior and a definition of 'evolution' is suggested.
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DOI 10.1086/288781
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Robert N. Brandon (1978). Adaptation and Evolutionary Theory. Studies in History and Philosophy of Science Part A 9 (3):181-206.
Robert N. Brandon (1981). Biological Teleology: Questions and Explanations. Studies in History and Philosophy of Science Part A 12 (2):91-105.

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