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Natural selection—probably the most well-known evolutionary mechanism—increases the prevalence of traits that enhance survival and reproduction. However, evolution does not merely propagate favorable traits, nor does it always benefit populations.
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In a population that is not at Hardy-Weinberg equilibrium, the frequency of alleles changes over time. Therefore, any deviations from the five conditions of Hardy-Weinberg equilibrium can alter the genetic variation of a given population. Conditions that change the genetic variability of a population include mutations, natural selection, non-random mating, gene flow, and genetic drift (small population size).
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A single nucleotide polymorphism or SNP is a single nucleotide variation at a specific genomic position in a large population. It is the most prevalent type of sequence variation found in the human genome. Point mutations that occur in more than 1% of the population qualify as SNPs. These are present once every 1000 nucleotides on an average in the human genome. Replacement of a purine with another purine (A/G) or a pyrimidine with another pyrimidine (C/T) is known as a transition. In contrast,...
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Sequencing of the human genome has opened up several best-kept secrets of the genome. Scientists have identified thousands of genome variations that exist within a population. These variations can be a single nucleotide or a larger chromosomal variation.
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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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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.
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Following the Dynamics of Structural Variants in Experimentally Evolved Populations
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The genomics of discrete polymorphisms maintained by disruptive selection.

Jun Kitano1, Kotaro Kagawa2, Takashi Tsuchimatsu3

  • 1Ecological Genetics Laboratory, National Institute of Genetics, Mishima, Shizuoka, Japan; Genetics Course, Graduate University for Advanced Studies, Mishima, Shizuoka, Japan.

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Summary

Disruptive selection drives the evolution of distinct traits (morphs) by favoring specific genetic architectures. Understanding how these architectures evolve is key to understanding speciation.

Keywords:
anisogamychromosomal inversiondisassortative matingheterostylysexual dimorphismsupergene

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Area of Science:

  • Evolutionary biology
  • Genetics
  • Speciation research

Background:

  • Disruptive selection can lead to the evolution of distinct phenotypes or morphs.
  • Genomic studies indicate that mutations often cluster, but molecular mechanisms of genetic interactions remain unclear.

Purpose of the Study:

  • To investigate how genetic architectures, including dominance, epistasis, and linkage, evolve under disruptive selection.
  • To determine the conditions that promote or constrain the evolution of genetic architectures leading to discrete morphs and speciation.

Main Methods:

  • Theoretical modeling of genetic architectures under disruptive selection.
  • Analysis of evolutionary dynamics of genetic variation.

Main Results:

  • Specific genetic architectures, defined by dominance, epistasis, and linkage patterns, are likely to evolve under disruptive selection, promoting discrete morphs.
  • Once an optimal genetic architecture evolves, disruptive selection may not further promote assortative mating, potentially constraining speciation.

Conclusions:

  • The evolution of specific genetic architectures is crucial for the formation of discrete morphs under disruptive selection.
  • Further research is needed to understand the rate at which these genetic architectures evolve to fully grasp the speciation process.