title: Commentary: Wilhelm Johannsen and the problem of heredity at the turn of the 19th century.
authors.affiliation: Department of Philosophy, Classics, History of Art and Ideas, University of Oslo, P.O. Box 1020, Blindern, 0315 Oslo, Norway. E-mail: Nils.roll-hansen@ifikk.uio.no.
authors.forename: Nils
authors.initials: N
authors.lastname: Roll-Hansen
mesh_terms: D005838:Genotype; D040941:Heredity; D006801:Humans