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Related Concept Videos

Natural Selection and Mating Preferences01:06

Natural Selection and Mating Preferences

The principle of natural selection posits that organisms better adapted to their environment are more likely to survive and reproduce. This principle is closely intertwined with mating preferences, a key aspect of sexual selection, which evolutionary psychologists believe is driven by instincts to propagate one's genes. Such instincts significantly influence mating behaviors and preferences between genders.
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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).Mechanisms of Genetic VariationThe original sources of genetic variation are mutations,...
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Determination of the Mating Efficiency of Haploids in Saccharomyces cerevisiae
05:39

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Published on: December 2, 2022

When do host-parasite interactions drive the evolution of non-random mating?

Scott L Nuismer1, Sarah P Otto, François Blanquart

  • 1Department of Biological Sciences, University of Idaho, Moscow, ID 83844, USA. snuismer@uidaho.edu

Ecology Letters
|June 5, 2008
PubMed
Summary

Parasite interactions can drive the evolution of disassortative mating in hosts, promoting genetic diversity. However, this requires specific conditions, and random or assortative mating may evolve otherwise.

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Area of Science:

  • Evolutionary Biology
  • Parasitology
  • Population Genetics

Background:

  • Parasite-host interactions are hypothesized to drive the evolution of disassortative mating in hosts, favoring genetically diverse offspring.
  • Previous research, including simulations and some empirical studies, has supported this hypothesis, particularly concerning mating by disease resistance genotype.
  • The generality of this phenomenon remains unclear due to limitations in existing theoretical models considering only specific genetic and mating scenarios.

Purpose of the Study:

  • To investigate the evolution of non-random mating in host-parasite systems using analytical models.
  • To explore a broader range of genetic and mating scenarios than previously considered.
  • To examine the potential for parasites to also evolve non-random mating in response to host interactions.

Main Methods:

  • Development and analysis of mathematical models incorporating diverse genetic and mating scenarios.
  • Inclusion of parasite mating strategies within the coevolutionary framework.
  • Analysis of conditions leading to disassortative, random, or assortative mating in hosts and parasites.

Main Results:

  • Coevolutionary interactions with parasites can indeed lead to the evolution of host disassortative mating, confirming previous simulation findings.
  • The evolution of host disassortative mating is contingent on specific infection genetics and mating modes that minimize sexual selection.
  • Under alternative conditions, hosts may evolve random or assortative mating; parasites also exhibit evolved non-random mating, potentially catalyzing sympatric speciation.

Conclusions:

  • Host-parasite coevolution can drive disassortative mating, but the conditions required are more restrictive than previously understood.
  • The evolution of mating systems in both hosts and parasites is complex and depends on specific ecological and genetic factors.
  • Assortative mating in interacting species, particularly in grouped populations, can promote sympatric speciation.