Question

Which is the best definition of directional selection? a process by which two species can no longer reproduce a process by which one of the extreme variations of a trait is favored a process by which individuals with either extreme of a trait are favored a process by which average individuals in a population are favored

Answer 1

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

Answer 2

The best definition of the directional selection is following - a process by which one of the extreme variations of a trait is favored.

In the population genetics, the directional selection can be referred as the mode of the natural selection.

In the process a dominant or extreme phenotype is generally favored over the other phenotype causing the frequency of allele for shifting over the time.