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A directional selection is a force in nature that causes a population to evolve towards one end of a trait spectrum. While some traits are discrete and have specific variations (think eye color), other traits are continuous, and exists as a wide range of nearly infinite values (think height).
Directional selection occurs when a particular trait becomes more advantageous (having higher fitness) in a changing environment, leading to a consistent shift in the frequency of that trait within a population. Over time, this shift can result in the evolution of a species.
In directional selection, a population’s genetic variance shifts toward a new phenotype when exposed to environmental changes. Diversifying or disruptive selection increases genetic variance when natural selection selects for two or more extreme phenotypes that each have specific advantages.
In population genetics, directional selection is a type of natural selection in which one extreme phenotype is favored over both the other extreme and moderate phenotypes. This genetic selection causes the allele frequency to shift toward the chosen extreme over time as allele ratios change from generation to generation.
Directional selection does the “heavy lifting” of evolution by tending to move the trait mean toward the optimum for the environment. It results in increased adaptedness of organisms. It is the principle process that Charles Darwin himself envisaged as driving adaptive evolution.
Directional selection is a type of natural selection in which the phenotype (the observable characteristics) of the species tends toward one extreme rather the mean phenotype or the opposite extreme phenotype.
and thus the equilibrium allele frequency of a a is. q^ = μ s−−√ (11.5.3) (11.5.3) q ^ = μ s. At realistic rates of selection and mutation, there is an important consequence of this equation: The equilibrium frequency of the deleterious allele is very low. As such, most of the deleterious alleles are carried by heterozygote carriers.
Directional selection is a type of natural selection in which a particular extreme phenotype is favored over other phenotypes, leading to a shift in the frequency distribution of a trait within a population.
Directional selection is the most common form of natural selection observed in any trait during the course of evolution. It is a type of selection in nature that causes a population to evolve toward one end of a trait spectrum.
Directional selection is a mode of natural selection where one extreme phenotype is favored over others, leading to a shift in the population's traits over time. This process drives evolutionary change by promoting the prevalence of beneficial traits that enhance survival and reproduction in a specific environment.