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Which type of selection favors the intermediate phenotype?
Stabilizing selection is very common. The individuals that survive and reproduce more successfully are those that have intermediate phenotypic values.
What is it called when evolution favors the extremes of a phenotype?
The directional selection theory says that an extreme phenotype (characteristics or traits) is favored over other phenotypes and this causes the allele frequency (how often the variant of a gene shows up in a population) to shift over time in favor of the extreme phenotype.