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Related Experiment Videos

The evolution of intratetrad mating rates.

Louise J Johnson1, Janis Antonovics, Michael E Hood

  • 1Department of Biology, University of Virginia, Charlottesville, Virginia 22903, USA. LJJ6n@virginia.edu

Evolution; International Journal of Organic Evolution
|March 11, 2006
PubMed
Summary

Intratetrad mating can increase genetic diversity, especially near mating type genes. This study shows it

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Area of Science:

  • Evolutionary genetics
  • Population genetics
  • Sexual reproduction

Background:

  • Intratetrad mating, the fusion of gametes from one meiosis, impacts genetic diversity.
  • This effect is pronounced in genomic regions associated with mating type loci.

Purpose of the Study:

  • To investigate the evolutionary dynamics of alleles modifying intratetrad mating rates.
  • To analyze these dynamics under models of heterozygote advantage and genetic load from recurrent mutation.

Main Methods:

  • Theoretical modeling of allele frequency changes.
  • Analysis of selection pressures on mating and recombination rates.

Main Results:

  • Intratetrad mating is favored when recombination rates are low relative to the frequency of lethal alleles.
  • Positive feedback mechanisms can accelerate the spread of modifiers for intratetrad mating.
  • Indirect selection between recombination and mating rates leads to decreased outcrossing.

Conclusions:

  • Outcrossing may persist at low frequencies in populations with high rates of intratetrad mating due to slow invasion of obligate intratetrad mating alleles under recurrent mutation.
  • The interplay between recombination and mating rates can drive a significant reduction in outcrossing, even without a direct cost of sex.

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