In PLoS Biology this week, investigators at Stanford and their colleagues demonstrate that "a simple genetic architecture underlies morphological variation in dogs." By creating a high-density map of genetic variation through genotyping 915 dogs with various phenotypes across 60,968 SNPs, the team identified "51 regions of the dog genome associated with phenotypic variation among breeds in 57 traits." The authors write that "across dog breeds, a small number of quantitative