Multiple combinations of genotypes are observed in most breeds. We assessed combinations of genotypes in individual dogs (A). The presence of a derived allele (whether heterozygous or homozygous) is indicated by a filled square. The first column represents the combination with derived genotypes at each marker; the mean weight of dogs with this combination is less than the mean weight of any other combination. The percent standard deviations for a given combination are typically smaller than the percent standard deviations of dogs sharing only a genotype at a single marker (which are reported in Fig. 2). The combinations observed in each breed are uniquely identified by the pairing of fill and outline color in B. Breeds are sorted by SBW. This analysis includes all 500 dogs genotyped.
