SORBUS (BOTANIK); GENOTYP + GENOTYPISCHE VARIATION (PFLANZENGENETIK); POPULATIONSGENETIK (PFLANZENÖKOLOGIE); POPULATIONSGRÖSSE + POPULATIONSDICHTE (PFLANZEN); GENETISCHE TRACERTECHNIKEN + MARKERGENE + REPORTERGENE (GENETISCHE TECHNIKEN); KANTON SCHAFFHAUSEN (SCHWEIZ); SORBUS (BOTANY); GENOTYPE + GENOTYPIC VARIATION (PLANT GENETICS); POPULATION GENETICS (PLANT ECOLOGY); POPULATION SIZE + POPULATION DENSITY (PLANTS); GENETICAL TRACER TECHNIQUES + MARKER GENES + REPORTER GENES (GENETIC TECHNIQUES); CANTON OF SCHAFFHAUSEN (SWITZERLAND)