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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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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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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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Behavior genetics explores how genetic inheritance influences human behavior. It focuses on how genes, passed from parents to offspring, contribute to the development of behavioral traits and tendencies. This branch of genetics seeks to understand the complex interplay between inherited genetic factors and environmental influences in shaping our behaviors.
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Genetic variation is the diversity in DNA sequences found among individuals of the same species. This diversity is crucial for a species' survival because it helps organisms adapt to environmental changes. Genetic variation begins with fertilization, where an egg and sperm cell merge. Each of these cells carries 23 chromosomes, up to 46 in the fertilized egg. Chromosomes are long DNA strands that contain genes, the basic units of heredity.
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Family-based selection: an efficient method for increasing phenotypic variability.

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Summary
This summary is machine-generated.

This study models artificial selection to increase behavioral trait variability in fruit flies. Family-based selection accelerates response but reduces genetic diversity compared to individual selection.

Keywords:
artificial selectionbehavioral individualityfamily-based selection; Drosophila melanogastermodelingphenotypic variability

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Area of Science:

  • Evolutionary biology
  • Quantitative genetics
  • Animal behavior

Background:

  • Individual differences in behavior (phenotypic variation) exist even in genetically identical organisms.
  • Heritable variation in traits is shaped by evolutionary forces, but selection on variability itself is poorly understood.

Purpose of the Study:

  • To model directional artificial selection for increasing the variability of a polygenic trait.
  • To investigate how different selection regimes impact selection response and genetic diversity.

Main Methods:

  • Developed a Python-based model for artificial selection on trait variability.
  • Focused on left-vs-right turn bias in Drosophila melanogaster.
  • Compared individual-based selection with family-based selection (half/full siblings).

Main Results:

  • Variability of turn bias is a heritable, polygenic trait, distinct from the non-heritable mean.
  • Family-based selection leads to faster response for increased variability.
  • Individual-based selection is slower but maintains greater genetic diversity.

Conclusions:

  • Population structure significantly influences selection response for trait variability.
  • Selection regimes impact the trade-off between response speed and genetic diversity.
  • The model aids in predicting and designing laboratory selection experiments for complex traits.