, Volume 117, Issue 1, pp 77–84 | Cite as

The B Chromosomes of the Grasshopper Eyprepocnemis Plorans and the Intragenomic Conflict

  • J.P.M. Camacho
  • J. Cabrero
  • M.D. López-León
  • M. Bakkali
  • F. Perfectti


The grasshopper Eyprepocnemis plorans harbours an extremely widespread polymorphism for supernumerary (B) chromosomes, which is found in almost all circum-Mediterranean and Caucasian populations hitherto analysed. B chromosomes in this species have been shown to evolve through several stages of parasitic and near-neutral nature, presumably because of an arms race between the standard (A) and B chromosomes. This intragenomic conflict can either be solved with the extinction of the neutralised B chromosome or, more interestingly, with the replacement of the neutralised B by a mutant version being parasitic again and thus prolonging B chromosome life. This species thus provides a complete view of the long-term life-cycle of parasitic B chromosomes.

B chromosomes Eyprepocnemis plorans genetic conflict host–parasite dynamics 


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Copyright information

© Kluwer Academic Publishers 2003

Authors and Affiliations

  • J.P.M. Camacho
    • 1
  • J. Cabrero
    • 1
  • M.D. López-León
    • 1
  • M. Bakkali
    • 1
  • F. Perfectti
    • 1
  1. 1.Departamento de GenéticaUniversidad de GranadaGranadaSpain

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