Is the human species a ring species?
http://en.wikipedia.org/wiki/Ring_species
The ring species is a relatively new concept and highly problematic for biologists. Do you think humans are a ring species, or have humans been around too short an amount of time for sufficient mutations to accumulate regionally, so that ALL humans are interfertiles with one another?
However, I realize that humans are incredibly genetically homogeneous, compared to say, chimps. The reason would be our species is very young and there was a significant bottleneck around 70000 years ago. So, I don’t think we were ever a ring species.
We’re not a ring species.
We’ve had too much gene flow to be a ring species. We travel well 
The Killers – Human (Live Rock am Ring 2009)
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