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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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Law of Independent Assortment02:03

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While Mendel’s Law of Segregation states that the two alleles for one gene are separated into different gametes, a different question of how different genes are inherited remains. For example, is the gene for tall plants inherited with the gene for green peas? Mendel asked this question by experimenting with a dihybrid cross; a cross in which both parents are homozygous for two distinct traits resulting in an F1 generation that are heterozygous for both traits.
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Law of Segregation01:49

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When crossing pea plants, Mendel noticed that one of the parental traits would sometimes disappear in the first generation of offspring, called the F1 generation, and could reappear in the next generation (F2). He concluded that one of the traits must be dominant over the other, thereby causing masking of one trait in the F1 generation. When he crossed the F1 plants, he found that 75% of the offspring in the F2 generation had the dominant phenotype, while 25% had the recessive phenotype.
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Overview
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Nondisjunction01:29

Nondisjunction

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During meiosis, chromosomes occasionally separate improperly. This occurs due to failure of homologous chromosome separation during meiosis I or failed sister chromatid separation during meiosis II. In some species, notably plants, nondisjunction can result in an organism with an entire additional set of chromosomes, which is called polyploidy. In humans, nondisjunction can occur during male or female gametogenesis and the resulting gametes possess one too many or one too few chromosomes.
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Related Experiment Video

Updated: May 10, 2025

Examination of Thymic Positive and Negative Selection by Flow Cytometry
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Positive and negative selective assortment.

Segismundo S Izquierdo1, Luis R Izquierdo2, Christoph Hauert3

  • 1Department of Industrial Organization and BioEcoUva, Universidad de Valladolid, Spain.

Journal of Theoretical Biology
|April 26, 2025
PubMed
Summary
This summary is machine-generated.

Selective assortment, where individuals choose partners based on observed strategies, significantly impacts population evolution. This partner choice mechanism can lead to positive or negative assortment, altering game equilibria and strategy evolution dynamics.

Keywords:
AssortmentEvolutionary dynamicsNegative assortmentSelective assortment

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Area of Science:

  • Evolutionary game theory
  • Population dynamics
  • Behavioral economics

Background:

  • Assortment, or the non-random distribution of individuals with specific strategies, influences population-level evolutionary outcomes.
  • Partner choice mechanisms, such as selective assortment, allow individuals to influence their interactions based on observed strategies.

Purpose of the Study:

  • To investigate the impact of selective assortment on the evolution and equilibria of strategies within populations.
  • To analyze how partner choice, leading to positive or negative assortment, shapes evolutionary trajectories.

Main Methods:

  • Modeling selective assortment as a partner choice mechanism.
  • Analyzing evolutionary game dynamics under different assortment scenarios.
  • Applying evolutionary dynamics, including replicator dynamics, to various games.

Main Results:

  • Selective assortment can generate either positive (like-with-like) or negative (like-with-unlike) interactions.
  • The type of assortment significantly affects population payoffs and the evolutionary stability of strategies.
  • Different games exhibit distinct responses to selective assortment under various evolutionary dynamics.

Conclusions:

  • Selective assortment is a crucial factor in shaping evolutionary outcomes in populations.
  • Understanding partner choice mechanisms is key to predicting evolutionary trajectories and game equilibria.
  • The study provides a framework for analyzing assortment effects across diverse evolutionary games.