Method: Based on the available Y-DNA information (paternal line - father of father etc.) members are grouped. This is possible with tools (e.g. FTDNA Genetic Distance, FTDNA TiP / Comparison, FTDNA Unique Haplotypes, Y-Utility, YPredictor) and databases ( e.g. Y STR/SNP trees). On the table Y-DNA Results > Colorized STR-Marker differences in every group are shown with red and blue background (see FAQ). For more info: Y-DNA FAQ, genetic distance calculation Y-STR, Phylogenetic Tree Construction for Y-DNA Haplogroups.