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Message: <blockquote data-quote="cotjones" data-source="post: 7665380" data-attributes="member: 573988">Complete randomness in mutation, not in selection.Dog breeds are artificial selection. Humans selectively breed, for example for small or large size. But because the gene pool is constantly mixed by strays and uncontrolled breeding, yes as you put it they are both dogs. However, this amount of distinction could've gone different. If the two breeds were in complete reproductive isolation they very well likely would no longer be able to form viable zygotes. At that point, you'd have 2 separate species and any new mutations would be solely isolated to the species it occurred in. This has been shown to happen in populations of fruit flies. But the fact that the 2 species can no longer access each others genes means they will very likely given enough time change to occupy their own ecological niche.</blockquote>

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