title: Genetics and the origin of species: an introduction.
authors.affiliation: Department of Ecology and Evolutionary Biology, University of California, Irvine, CA 92697-2525, USA.
authors.forename: F J
authors.initials: FJ
authors.lastname: Ayala
authors.forename: W M
authors.initials: WM
authors.lastname: Fitch
mesh_terms: D000818:Animals; D005075:Biological Evolution; D014644:Genetic Variation; D012641:Selection, Genetic; D013045:Species Specificity