The Four Kinds of Dog
Analyzing the DNA of 85 dog breeds, scientists found that genetic similarities clustered them into four broad categories. The groupings reveal how breeders have recombined ancestral stock to create new breeds; a few still carry many wolflike genes. Researchers named the groups for a distinguishing trait in the breeds dominating the clusters, though not every dog necessarily shows that trait. The length of the colored bars in a breed’s genetic profile shows how much of the dog’s DNA falls into each category. (John Tomanio, senior graphics editor, National Geographic)
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