|Barked: Sun Dec 11, '11 7:42pm PST |
|I think the concept of a breed DNA test is interesting, but before spending money on one, I want to know what they're actually looking at. Humans and chimpanzees, two different species, share at least 95% of their DNA. Dogs are all the same species, just different varieties. How much difference can there actually be between say, Pug DNA and Great Dane DNA? How many genes, and how many alleles ("Versions" of genes) are they looking at? Then think about how many different dog breeds once existed but no longer exist, and how many current dog breeds had common ancestors, so the same allele (for a merle coat for example) might be found in Dachshunds and Australian Shepherds. What makes the test "know" that the dog being tested was really Australian Shepherd? Maybe the dog is a Dachshund mix instead. The mutation which makes dogs sensitive to ivermectin is found in many breeds. So, how do they know if a dog is part Collie, or part Sheltie? I have a really hard time believing that a DNA test can so precisely determine the breed make up, and even do it be percentage not just "these are the breeds which are likely present somewhere in your dog's ancestry."
If somebody knows the actual genetics used in these tests, I'd love to hear it!
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