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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- Blair, W. F. (1944). Inheritance of the white cheek character in mice of the genusPeromyscus. Contr. Lab. Vert. Biol. Univ. Mich. 25.Google Scholar
- Fisher, R. A. (1939). Selective forces in wild populations ofParatettix texanus.Ann. Eugen., Lond.,9, 109.Google Scholar
- Huxley, J. S. (1939). Clines: an auxiliary method in taxonomy.Bijdr. Diirk. 27, 491.Google Scholar
- Huxley, J. S. (1942).Evobution. The Modern Synthesis. London.Google Scholar
- Southern, H. N. (1943).The Two Phases of Stercorarius parasiticusLinnaeus, pp. 443–85.Google Scholar
- Sumner, F. B. (1932). Genetic, distributional, and evolutionary studies of the subspecies of deermice (Peromyscus).Bibl. Genet. 9, 1.Google Scholar