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Related Concept Videos

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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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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Frequency-dependent Selection01:21

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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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The value of indirect selection : II. Progeny testing.

S R Searle1

  • 1Biometrics Unit, Cornell University, Ithaca, N.Y., USA.

TAG. Theoretical and Applied Genetics. Theoretische Und Angewandte Genetik
|December 10, 2013
PubMed
Summary

Progeny testing with indirect selection can accelerate genetic improvement more than direct selection under specific conditions. These findings offer insights for optimizing animal breeding strategies and genetic gain.

Area of Science:

  • Quantitative genetics
  • Animal breeding
  • Selection theory

Background:

  • Genetic improvement in livestock relies on effective selection methods.
  • Direct selection and progeny testing are common breeding strategies.
  • Indirect selection offers an alternative approach to genetic gain.

Purpose of the Study:

  • To identify conditions where indirect selection via progeny testing surpasses direct selection for genetic improvement.
  • To provide a theoretical framework for optimizing selection strategies in animal populations.

Main Methods:

  • Development of theoretical conditions for the superiority of indirect selection.
  • Comparative analysis of genetic gain rates between direct and indirect selection methods.
  • Extension of principles to analogous conditions for mass selection.

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Main Results:

  • Specific genetic and phenotypic parameters determine the advantage of indirect selection.
  • Progeny testing combined with indirect selection can yield faster genetic progress than direct selection.
  • The study provides criteria for when to implement indirect selection strategies.

Conclusions:

  • Indirect selection through progeny testing is a viable strategy for enhanced genetic improvement.
  • Understanding the conditions for its success is crucial for applied animal breeding.
  • This research contributes to the theoretical basis of optimizing selection programs.