Hybrid speciation in experimental populations of yeast.
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.
Greig
Duncan
D
The Galton Laboratory, Department of Biology, University College London, Gower Street, London WC1E 6BT, UK.
Louis
Edward J
EJ
Borts
Rhona H
RH
Travisano
Michael
M
D000782:Aneuploidy; D015825:Chromosomes, Fungal / Q000235:genetics / Q000502:physiology; D003433:Crosses, Genetic; D003434:Crossing Over, Genetic; D005298:Fertility; D014644:Genetic Variation; D006824:Hybridization, Genetic; D007621:Karyotyping; D016133:Polymerase Chain Reaction; D012440:Saccharomyces / Q000235:genetics* / Q000502:physiology; D012441:Saccharomyces cerevisiae / Q000235:genetics* / Q000502:physiology; D013172:Spores, Fungal / Q000502:physiology