Question

What is the best definition of directional selection

Answer 1

In population genetics, directional selection is a mode of natural selection in which an extreme phenotype is favored over other phenotype, causing the allele frequency to shift over time in the direction of that phenotype

Answer 2

Directional selection is a mode of natural selection an extreme phenotype is favored over other phenotypes this causes the allele to shift over time in the direction of the favored phenotype