similarity evidence genetic similarity evidence A genetic similarity analysis might consider genetic markers, polymorphisms, alleles, or other characteristics sometimes considered as part of the field of traditional genetics. Although an attempt has been made to treat as distinct the concepts of "genetic", "genotypic", "genomic", and "sequence", there is considerable overlap in usage throughout the field of biology. IGTS inferred from genetic similarity eco A type of similarity based on genotype without respect to expression. ECO:0000051