What is the natural selection that shifts the adaptation of an entire population called?

Name: What is the natural selection that shifts the adaptation of an entire population called?
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Directional selection is a mode of natural selection in which an extreme phenotype is favored over other phenotypes, causing the allele frequency to shift over time in the direction of that phenotype. This results in the adaptation of an entire population towards one end of the spectrum of traits.

What Is the Natural Selection That Shifts the Adaptation of an Entire