Mitochondrial DNA is passed down from the mother as gart of the egg s genetic contribution. Identical twins, for example, have the same nuclear and mitochondrial DNA,since they re produced when a single egg is fertilized and the resulting embryo splits in two.With a clone, the situation is different. Because the cloning process that Hwang says he used to create Snuppy involves two dogs-one for the nucleus and another for the egg-Snuppy s mitochondrial DNA should not match Tai s. That s what Rhee s scientists say they ve found and what Hwang undoubtedly hopes the university and Nature will find as well. Final, ironclad proof of Snuppys provenance would involve showing that the dog s mitochondrial DNA matches that of his egg donor .It s not clear, however, whether that test is being done.

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