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directional selection occurs when

graphs of directional selection

an insect that exhibits resistance to a pesticide

new alleles arise by

directional selection in farming

new variations of genes may be produced by

directional selection means that

speciation is most precisely determined

disruptive selection favors

directional selection tends to eliminate

gene shuffling

def stabilizing selection

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Directional selection

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Wikipedia

In population genetics, directional selection occurs when natural selection favors a single phenotype and therefore allele frequency continuously shifts in one direction. Under directional selection, the advantageous allele will increase in frequency independently of its dominance relative to other alleles (i.e. even if the advantageous allele is recessive, it will eventually become fixed). Directional selection stands in contrast to balancing selection where selection may favor multiple alleles, and is the same as purifying selection which removes deleterious mutations from a population, in other words it is directional selection in favor of the advantageous heterozygote. Directional selection is a particular mode or mechanism of natural selection.