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selection pressureSelektionsdruck (ger.)

  • Differential mortality or fertility such as tends to make a population adapt genetically. (OED 2011)
    mutation mutation pressure

    The reduction of indiffer- ent vestigial organs need not therefore be looked upon as: the direct consequence of mutation pressure but as a by-product of multiple selection pressures of a higher order of magnitude.

    Wright, S. (1929). Fisher’s theory of dominance. Amer. Nat. 63, 274-279: 277.


    the selection pressure, being always just twice the mutation pressure (until dominance is nearly complete), would in time practically fix the modifier against such mutation

    Wright, S. (1929). The evolution of dominance: Comment on Dr. Fisher’s reply. American Naturalist 63, 556-561: 557.


    selection pressure 1: Any environmental factor that results in natural selection. 2: The intensity of natural selection q.v. measured as the alteration of the genetic composition of a population from generation to generation.

    Lincoln, R.J., Boxshall, G.A. & Clark, P.F. (1982). A Dictionary of Ecology, Evolution and Systematics: 224.