mostly the C variety,
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, or haplogroup. Modern dogs in those regions have mostly the A haplogroup. That shift probably didn’t happen by chance, but was due to dogs from East Asia being introduced into Europe and taking over genetically.




Although the new study indicates there were two origin points for dogs,
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, humans’ canine companions have since mixed and mingled. By comparing mitochondrial DNA, the genetic material inside energy-generating organelles,
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, from 59 ancient European dogs and 167 modern dogs,
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, the researchers determined that East Asian dogs at least partially genetically replaced European dogs in the distant past. Mitochondria are inherited from the mother. Ancient European dogs’ mitochondrial DNA varieties,
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, or haplogroups,
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, differed from those of modern dogs,
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, the researchers found. Of the ancient dogs, 63 percent carried haplogroup C and 20 percent carried haplogroup D. But in present-day dogs, 64 percent carry haplogroup A and 22 percent carry haplogroup B. That shift and other evidence indicate that dogs from the East moved west with humans, and Eastern dogs passed more of their genetic heritage to descendants than Western dogs did.
Archaeological evidence backs up the dual origin story. Dogs as old as 12,500 years old have been found in East Asia. In Europe,
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, dogs date back to 15,000 years ago. But there is

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