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By John Burdon Sanderson Haldane

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This would imply such obstacles to mating with a dominant that the first recessive to appear could never mate at all. Probabilities of this order may, however, occur in selective fertilisation. Hence inbreeding or self-fertilisation appears to be necessary in the early stages of selection of a recessive character if this process is to be fast enough to be an effective cause of evolution. They cannot be replaced by moderate degrees of selective mating or fertilisation. SUMMARY. 2) derived for the effect of selection on such populations.

A203, 53. Pearson. 1908. Proc. R. Soc. 54, 72. Pearson and Lee. 1903. Biometrika 2, 371. Punnett. Mimicry in Butterflies, 154. Punnett. 1917. J. Hered. 8, 464. Renner. 1917. Z. indukt. -u. Verblehre 18, 121. Schimidt. 1920. C. r. Tray. Lab. Carlsberg, 14. Warren. 19t7. Genetics 2, 305. Wood. 1905. J. Agric. Science 1,364. A MATHERJATICAL THEORY OF NATURAL AND ARTIFICIAL SELECTION. PART I1 THE IKFLUEIKCE OF PARTIAL SELF-FERTILIS-TIOS, ISBREEDISG, ASSORTATIVE MATING, A S D SELECTIVE FERTILISXTION ON THE COMPOSITION OF MESDELIXS POPULATIONS, AND ON NATURAL SELECTION.

Selection therefore occurs much as with a normally inherited autosomal factor. REFERENCES. 1. HARRISON and GARRETT. Proc. Boy. Soc. B, 99, p. 241, 1926. 2. GAGER and BLAKESLEE. Proc. Nat. Ac. Sci. 13, p. 75, 1927. 3. 4. 5. 6. FISHER. Proc. Roy. Soc. Edin. 42, p. 321, 1922. KOENIGS. Darb. Bull. (2) 7, p. 340, 1883. HALDANE. Trans. Camb. Phil. Soc. 23, p. 19, 1924. HALDANE. Biol. Proc. Camb. Phil. Soc. 1, p. 158, 1924. 7. MBTZ. Proc. Nat. Ac. Sci. 12, p. 690, 1926. 220 Mr Haldane, A mathematical theory A mathematical theory of natural and artificial selection.

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A Mathematical Theory of Natural and Artificial Selection by John Burdon Sanderson Haldane

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