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Science 29 November 2002:
Vol. 298. no. 5599, pp. 1773 - 1775
DOI: 10.1126/science.1076374
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Reports

Hybrid Speciation in Experimental Populations of Yeast

Duncan Greig,12 Edward J. Louis,3 Rhona H. Borts,3 Michael Travisano2*

Most models of speciation require gradual change and geographic or ecological isolation for new species to arise. Homoploid hybrid speciation occurred readily between Saccharomyces cerevisiae and Saccharomyces paradoxus. Hybrids had high self-fertility (about 82%), low fertility when backcrossed to either parental species (about 7.5%), and vigorous growth under different thermal environments that favored one or the other of the parental species. Extensive karyotypic changes (tetrasomy) were observed in the hybrids, although genic incompatibilities accounted for 50% of the variation in self-fertility.

1 The Galton Laboratory, Department of Biology, University College London, Gower Street, London WC1E 6BT, UK.
2 Department of Biology, University of Houston, 4800 Calhoun Road, Houston, TX 77204, USA.
3 Department of Genetics, University of Leicester, University Road, Leicester LE1 7RH, UK.
*   To whom correspondence should be addressed. E-mail: mtrav{at}uh.edu

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