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Sex ratio evolution in lemmings.

M Bulmer1

  • 1Department of Biomathematics, Oxford, U.K.

Heredity
|October 1, 1988
PubMed
Summary

Segregation distortion in male varying lemmings (Dicrostonyx torquatus) influences sex ratios and XY females. This distortion is expected to evolve, suggesting the X* mutation is unlikely an adaptation for a female-biased sex ratio.

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Area of Science:

  • Evolutionary genetics
  • Mammalian genetics
  • Population genetics

Background:

  • The varying lemming (Dicrostonyx torquatus) exhibits numerous XY females due to the X-linked mutation X*.
  • Segregation distortion in males, with a Y sperm ratio of approximately 0.56, significantly impacts sex ratio and XY female frequency.

Purpose of the Study:

  • To theoretically analyze the evolution of segregation distortion in Dicrostonyx torquatus.
  • To determine if segregation distortion is an expected evolutionary outcome in this system.
  • To evaluate the adaptive significance of the X* mutation in relation to sex ratio bias.

Main Methods:

  • Theoretical analysis of segregation distortion dynamics.
  • Modeling of evolutionary processes under random mating.
  • Consideration of reproductive compensation mechanisms.

Main Results:

  • The observed degree of segregation distortion is expected to evolve under random mating in Dicrostonyx.
  • Reproductive compensation for YY zygote loss by XY females is likely an automatic process.
  • The evolution of segregation distortion makes the X* mutation an unlikely adaptation for a female-biased sex ratio.

Conclusions:

  • Segregation distortion is a predictable evolutionary outcome in the Dicrostonyx system.
  • The X* mutation's role is likely not to create a female-biased sex ratio.
  • Understanding segregation distortion is key to explaining genetic anomalies in Dicrostonyx.

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