Evolutionary pressure
Any cause that reduces reproductive success in a proportion of a population / From Wikipedia, the free encyclopedia
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Evolutionary pressure, selective pressure or selection pressure is exerted by factors that reduce or increase reproductive success in a portion of a population, driving natural selection.[1] It is a quantitative description of the amount of change occurring in processes investigated by evolutionary biology, but the formal concept is often extended to other areas of research.
In population genetics, selective pressure is usually expressed as a selection coefficient.