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Selection against an extreme
Selection against both extremes
The last of the Four Pillars is Reproduction. Individuals that are successful have babies and pass on their advantageous traits. Eventually, the population will shift so that most organisms do have their advantageous traits.
Charles Darwin also had the Three types of Natural Selection. The first is Directional Selection, takes place when individuals with one extreme of the phenotype have higher fitness than those near the middle or at the other end of the curve.
Stabilizing Selection takes place when individuals with an average or mid-range phenotype have higher fitness than individuals at either end. Going against both extremes.
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