Nhận biết (M1)

Predating the European colonization of Canada, the Tahltan bear dog vanished due to interbreeding with dogs brought from Europe. In contrast, the Inuit dog persists as a distinct breed, and DNA testing confirms its descent from precolonial North American dogs. It also has genetic markers found in the dogs of East Asia but absent in those of Europe. That finding supports the theory that the precolonial breeds developed by Indigenous peoples descend from dogs that migrated from Asia in the last ice age. The Carolina dog, a yellow-coated breed native to rural pockets of the Southeastern United States, likely has such an origin too.

Which finding, if true, would most directly support the underlined claim?

• A.

  Additional DNA testing confirms that the Inuit dog and the Carolina dog share a rare set of genes not found in any East Asian breeds.

• B.

  The Carolina dog carries a genetic marker that is not found in the dog populations of Europe but is present in the dog populations of East Asia.

• C.

  Dogs in feral populations in the Southeastern United States have a set of genes also found in East Asian breeds imported in recent decades.

• D.

  Identical genetic markers are identified in remains of both the Tahltan bear dog and a dog population it interbred with.