Selective pressure is pressure exerted by the environment or man on a certain population through removal of the bearer of certain traits, e.g. an above-average large or below-average small individual, or by preventing such an individual from reproducing. Selective pressure need not always mean a negative effect on the bearer of undesirable forms of the trait, but can just as well consist in support for individuals with the desirable form of the trait.
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The classical Darwinian theory of evolution can explain the evolution of adaptive traits only in asexual organisms. The frozen plasticity theory is much more general: It can also explain the origin and evolution of adaptive traits in both asexual and sexual organisms Read more