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A Study of Frequency-Dependent Selection Observed in the Esterase-6 Locus of DROSOPHILA MELANOGASTER Using a

S L Huang1, M Singh, K Kojima

  • 1Department of Zoology, University of Texas at Austin, Austin, Texas 78712.

Genetics
|May 1, 1971
PubMed
Abstract

No abstract available in PubMed .

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Frequency-dependent Selection01:21

Frequency-dependent Selection

When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.Positive Frequency-Dependent SelectionIn positive...
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Types of Selection

Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural selection can be directional, stabilizing, or disruptive. Directional selection favors one extreme trait and shifts the population towards that phenotype while selecting against individuals displaying alternate traits. Stabilizing selection favors an intermediate trait with a narrow range of variation. Deviation from the optimal phenotype towards an...

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