Most mutations within genes are fitness and are extremely important for evolution, since their directional selection leads to adaptive evolution.
12.
For example, let us take the mathematically straightforward yet biologically improbable case of the rabbits : Suppose directional selection were taking place.
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Directional selection was first described by Charles Darwin in the book " Origin of Species " as a form of natural selection.
14.
Alternatively, the values of the behavioural traits are not maximized by directional selection, but rather are under the influence of stabilizing selection.
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Averageness has been a result of stabilizing selection whereas facial paedomorphosis or juvenile traits are a result of directional selection ( Wehr, 2001 ).
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The first is directional selection, which is a shift in the average value of a trait over time for example, organisms slowly getting taller.
17.
Directional selection occurs when an allele has a greater fitness than others, so that it increases in frequency, gaining an increasing share in the population.
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One resolution to the lek paradox involves female preferences and how preference alone does not cause a drastic enough directional selection to diminish the genetic variance in fitness.
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The introduced species often creates a rapid directional selection in the other species within that ecosystem and those species cannot evolve quickly enough to adjust to this new state.
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However, there is no qualitative difference in directional selection on C between stabilizing selection ( i . e . no sexual selection ) and directional selection on T.
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