2019-08-222019-08-221912-12-012012-10-23https://hdl.handle.net/20.500.12503/25880application/pdfenEcology and Evolutionary BiologyEvolutionGeneticsLife SciencesOther Genetics and GenomicsMendelian inheritancegeneticsheredityScientific Proceedings of the Royal Dublin Society; Unsound Mendelian Developments Especially as Regards the Presence and Absence Theoryarticle