title: Molecular evolution and genetics of postzygotic reproductive isolation in plants.
abstract: In just the last few years, plant geneticists have made tremendous progress in identifying the molecular genetic basis of postzygotic reproductive isolation. With more than a dozen genes now cloned, it is clear that plant hybrid incompatibilities usually evolve via two or more mutational steps, as is predicted by the Dobzhansky-Muller model. There is evidence that natural selection or random genetic drift can be responsible for these incompatibilities.
authors.affiliation: Department of Genetics, University of Georgia Athens, GA 30602, USA.
authors.forename: Andrea L
authors.initials: AL
authors.lastname: Sweigart
authors.forename: John H
authors.initials: JH
authors.lastname: Willis