A Mathematical Theory of Natural and Artificial Selection.
J. B. S. Haldane · 2022
A satisfactory theory of natural selection must be quantitative. In order to establish the view that natural selection is capable of accounting for the known facts of evolution we must show not only that it can cause a species to change, but that it can cause it to change at a rate which will account for present and past transmutations. In any given case we must specify: The mode of inheritance of the character considered, The system of breeding in the group of organisms studied, The intensity of selection, Its incidence (e.g. on both sexes or only one), and The rate at which the proportion of organisms showing the character increases or diminishes.