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Hybrid speciation in experimental populations of yeast

By Duncan Greig, Edward J. Louis, Rhona H. Borts and Michael Travisano

Abstract

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

Publisher: American Association for the Advancement of Science
Year: 2002
DOI identifier: 10.1126/science.1076374
OAI identifier: oai:lra.le.ac.uk:2381/2021
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