Genetic variation true Somatic mutations DNA variation beta12orEarlier Stable, naturally occurring mutations in a nucleotide sequence including alleles, naturally occurring mutations such as single base nucleotide substitutions, deletions and insertions, RFLPs and other polymorphisms. Mutation Genomic variation Genetic_variation http://purl.bioontology.org/ontology/MSH/D014644 Polymorphism Genomics Molecular genetics