title: Gradualism versus punctualism in speciation: reproductive isolation, morphology, genetics.
mesh_terms: D000818:Animals; D005075:Biological Evolution; D004330:Drosophila / Q000235:genetics; D005260:Female; D005828:Genetics, Population; D005843:Geography; D008297:Male; D008957:Models, Genetic; D010641:Phenotype; D010944:Plants / Q000235:genetics; D012098:Reproduction; D013045:Species Specificity