Hybrid speciation in experimental populations of yeast

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

Research output: Contribution to journalArticlepeer-review

141 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)1773-1775
Number of pages3
Issue number5599
StatePublished - Nov 29 2002


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