(March 11, 2015 at 12:37 pm)JesusHChrist Wrote:(March 11, 2015 at 11:50 am)Huggy74 Wrote: A Great Dane and Chihuahua belong to the same species.
http://en.wikipedia.org/wiki/Reproductiv..._isolation
You do realize that inability to mate ultimately could result in different species, right?
While Great Danes and Chihuahuas can mate biologically *so far*, if they are unable to mate mechanically, they could diverge into multiple species.
It's not as simple as you make it out to be.
All that is required is isolation. Mechanical isolation is just one possibility.
If you're going to argue and don't want to appear the fool, read for Zeus' sake.
Actually, if you isolated a viable population of Chihuahuas and a viable population of Great Danes from all other dogs, you could consider them separate species since they cannot produce viable offspring in nature. You could argue that dogs have become a type of ring species with the ring being determined not by location but by size.
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