Summary
Where one phenotype is favoured in one area and another phenotype in a neighbouring area, the character in question may be expected to show a cline in the neighbourhood of the boundary. On certain assumptions the relation between the intensity of selection, the mean distance migrated per generation, and the slope of the cline can be calculated. The relation is used for a provisional calculation of intensities of selection in a population ofPeromyscus polionotus. These have the very low value of about 0.1%.
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Haldane, J.B.S. The theory of a cline. Journ. of Genetics 48, 277–284 (1948). https://doi.org/10.1007/BF02986626
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DOI: https://doi.org/10.1007/BF02986626