Gametic incompatibilities between races of Drosophila melanogaster

J. A. Alipaz, C. I. Wu, T. L. Karr

Research output: Contribution to journalArticle

47 Scopus citations

Abstract

Reproductive-isolating mechanisms between nascent species may involve sperm-egg recognition and have been best described in externally fertilizing organisms where such recognition is essential in preventing undesirable fertilizations. However, reproductive barriers in internally fertilizing species differ in significant ways, and a direct role for sperm-egg interactions has yet to be demonstrated. Females of many strains of Drosophila melanogaster from Zimbabwe, Africa, do not mate readily with cosmopolitan males. This polymorphism in mate choice is postulated to represent incipient speciation. We now report that, in one direction, crosses between the above populations produce far fewer offspring than reciprocal crosses due to a lower rate of egg hatch. We established that egg inviability in these crosses was due to defects in fertilization. Thus, even in taxa with internal fertilization, gametic incompatibility may be a mechanism relevant to reproductive isolation during incipient speciation.

Original languageEnglish (US)
Pages (from-to)789-795
Number of pages7
JournalProceedings of the Royal Society B: Biological Sciences
Volume268
Issue number1469
DOIs
StatePublished - Apr 22 2001
Externally publishedYes

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Keywords

  • Drosophila melanogaster
  • Gametic incompatibility
  • Incipient speciation
  • Reproductive isolation

ASJC Scopus subject areas

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

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