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Related Experiment Videos

Polymorphism in genes that influence sperm displacement

T Prout1, A G Clark

  • 1Center for Population Biology, University of California, Davis 95616, USA.

Genetics
|September 1, 1996
PubMed
Summary
This summary is machine-generated.

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Genetic variation in sperm competition, specifically sperm displacement, can be maintained. A population genetic model shows that alleles influencing sperm displacement, fecundity, and mating ability can lead to stable genetic polymorphisms.

Area of Science:

  • Evolutionary Biology
  • Population Genetics
  • Reproductive Biology

Background:

  • Paternity skew in multiply inseminated females often favors the most recent male.
  • Sperm competition, particularly sperm displacement, is a strong selective force.
  • Genetic variation in sperm displacement ability is empirically observed, yet its maintenance is unclear.

Purpose of the Study:

  • To investigate the population genetic conditions that maintain genetic polymorphism in alleles affecting sperm displacement.
  • To explore how pleiotropic effects on fecundity and mating ability influence sperm competition dynamics.

Main Methods:

  • Development of a one-locus population genetic model.
  • Analysis of allelic variants with pleiotropic effects on sperm displacement, fecundity, and mating ability.

Related Experiment Videos

  • Identification of conditions for protected polymorphism.

    • Main Results:

    • The model demonstrates that stable genetic polymorphism can be maintained without induced overdominance.
    • Pleiotropic effects of alleles on fecundity and mating ability are key to maintaining variation.
    • Conditions for protected polymorphism in sperm displacement alleles were identified.

    Conclusions:

    • Genetic variation in sperm displacement can persist due to the complex interplay of reproductive traits.
    • Population genetic models are crucial for understanding the evolutionary maintenance of sperm competition variation.
    • Findings have implications for understanding the defense of resident sperm against displacement.