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Related Concept Videos

Frequency-dependent Selection01:21

Frequency-dependent Selection

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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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Types of Selection01:46

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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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Overview
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Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.
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Inclusive Fitness00:57

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Most altruistic behavior—in which one animal helps another at a cost to themselves—occurs between relatives. Scientists think these altruistic behaviors evolved because they increase the inclusive fitness of the animal providing help.
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Organisms that are well-adapted to their environment are more likely to survive and reproduce. However, natural selection does not lead to perfectly adapted organisms. Several factors constrain natural selection.
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Outgroups and Positive Selection: The Nothobranchius furzeri Case.

Arne Sahm1, Matthias Platzer1, Alessandro Cellerino2

  • 1Leibniz Institute on Aging, Fritz Lipmann Institute, Jena, Germany.

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Positive selection analysis helps identify evolutionary adaptations. This study compares two methods using the turquoise killifish genome to pinpoint adaptive genetic changes in aging-related genes.

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Area of Science:

  • Evolutionary biology
  • Genomics
  • Comparative genomics

Background:

  • Genome and transcriptome sequencing are increasingly available for diverse species.
  • Positive selection analysis is a key tool for understanding evolutionary adaptations.
  • The turquoise killifish (Nothobranchius furzeri) is a valuable model organism for aging research.

Purpose of the Study:

  • To compare two distinct positive selection analysis approaches.
  • To apply these methods to the Nothobranchius furzeri genome.
  • To identify the origins of adaptive evolution in aging-related genes within this species.

Main Methods:

  • Utilizing the Nothobranchius furzeri genome sequence.
  • Implementing two different positive selection analysis strategies with varying outgroup selections.
  • Comparative genomic analysis.

Main Results:

  • The study successfully applied and compared two positive selection analysis methods.
  • The identified positively selected sites provide insights into adaptive evolution in N. furzeri.
  • Specific aging-related genes were highlighted as targets of positive selection.

Conclusions:

  • The combined approach of different positive selection analyses enhances the accuracy of identifying adaptive evolution.
  • This study provides a framework for investigating adaptive genetic changes in aging using genomic data.
  • The findings contribute to understanding the genetic basis of aging in the turquoise killifish.