The degree of inbreeding F
within breed populations. The degree of inbreeding, FIS, as determined for 141 purebred breeds (681 individuals, ~5 individuals per breed) and two Alaskan sled dog sprint and distance racing populations (five sprint and five distance individuals). The 141 breeds are listed in alphabetical order from top to bottom and are viewed in two identically scaled panels side by side. The vertical red line indicates the midpoint in Hardy Weinberg equilibrium, with inbreeding values ranging from -1 (below the red line) to +1 (above the red line). The more negative values indicate an excess of heterozygosity while the more positive values represent an excess of homozygosity. Each blue bar represents the degree of inbreeding for a single breed. The purple bar signifies the sprint dogs, and the green bar indicates the distance dogs. We observe an excess of heterozygosity within the sprint sled dogs.