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Related Concept Videos

Mate Choice01:20

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Mate choice—the decision about whom to mate with—is a type of natural selection, since animals must reproduce to pass down their genes. Mate choice is also called intersexual selection because the behavior occurs between the sexes.
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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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Determination of the Mating Efficiency of Haploids in Saccharomyces cerevisiae
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Mating system, Haldane's sieve, and the domestication process.

Joëlle Ronfort1, Sylvain Glemin

  • 1UMR AGAP (CIRAD-INRA-Montpellier SupAgro), 2 Place Pierre Viala 34060 Montpellier Cedex 1, France. Joelle.ronfort@supagro.inra.fr

Evolution; International Journal of Organic Evolution
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Summary

Self-fertilizing plants adapt using recessive genes, unlike outcrossing species which favor dominant genes. This study confirms theoretical predictions about mating systems and plant adaptation.

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Area of Science:

  • Evolutionary biology
  • Plant genetics
  • Population genetics

Background:

  • Mating systems significantly influence adaptation dynamics and the genetic basis of traits.
  • Outcrossing favors dominant mutations (Haldane's sieve), while self-fertilization is predicted to reduce this bias.
  • Domestication provides a model system to study plant adaptation.

Purpose of the Study:

  • To test the prediction that selfing reduces the bias towards dominant mutations during adaptation.
  • To investigate the role of gene dominance in plant domestication across different mating systems.

Main Methods:

  • Compiled data on the dominance of quantitative trait loci (QTL) associated with domestication traits.
  • Analyzed QTL dominance patterns in predominantly selfing, outcrossing, and mixed-mating plant species.

Main Results:

  • Selfing species showed adaptation primarily through recessive and partially recessive QTL.
  • Outcrossing species exhibited a higher proportion of dominant or partially dominant QTL, aligning with Haldane's sieve.
  • Mixed-mating species displayed dominance levels similar to selfing species.

Conclusions:

  • Plant adaptation to cultivation differs in genetic architecture based on mating system.
  • Recessive alleles can contribute significantly to adaptation, even in species with moderate selfing rates.
  • This study provides empirical support for theoretical models of mating systems and adaptive evolution.