Domestic dogs are good friends of humans. Although they are very different from each other, these different groups of domestic dogs have a common ancestor-the gray wolf. The gray wolf is very extensive in the global branch, but domestic dogs everywhere are not It has evolved from gray wolves everywhere. By starting with the genome D. NA. and comparing the genetic diversity of domestic dog populations from different regions, the researchers found that the domestic dog population from southern East Asia has the highest diversity. At the same time, the structure of the phylogenetic tree also supports the common origin of domestic dogs. On the phylogenetic tree, the end of each branch represents a group, and the more closely related groups will be closer to the tree. In this study, domestic dog samples from southern East Asia were located at the base of the phylogenetic tree. The text is intended to explain:. ['Domestic dogs originate from the very widely distributed gray wolf.', 'Genome D. NA. Study addresses domestic dog origin.', 'Domestic dogs with different temperaments and shapes have the same origin.', 'Phylogenetic tree principle provides support for animal evolution research.']