Integration of a B chromosome into the A genome of a wasp, revisited

S. M.S.R. Araújo, S. G. Pompolo, F. Perfectti, J. P.M. Camacho

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


A previous study showed that in the haplodiploid solitary wasp Trypoxylon albitarse, most individuals carry one B chromosome per haploid genome, the same dosage as the standard (A) chromosomes, indicating a possible regularization of B-chromosome meiotic behaviour and its integration into the A genome. In a new sampling, we have analysed 15 populations (including 9 out of the 10 previously analysed) to test the evolution of this integration process. The new results provide a direct report of the invasion process in the Porto Firme population, where B frequency has dramatically increased in only four generations. In the populations from the Viçosa region, however, B frequency has remained stable, although the principal B type, the metacentric one, has increased in frequency at the expense of the acrocentric one in several populations. The implications of these new results on the hypothesis of the integration of these B chromosomes, as regular members of the A genome, are discussed.

Original languageEnglish (US)
Pages (from-to)1475-1478
Number of pages4
JournalProceedings of the Royal Society B: Biological Sciences
Issue number1499
StatePublished - Jul 22 2002
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Biochemistry, Genetics and Molecular Biology(all)
  • Immunology and Microbiology(all)
  • Environmental Science(all)
  • Agricultural and Biological Sciences(all)


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