This is a speculative thread. I know I'm no geneticist, so consider any gaffes in that area to be good intentioned, please. :o
What would it take for humans to split into two distinct species, unable to interbreed with each other?
I understand the two groups would have to be rather isolated from each other. For this I was suggest we look at a world ~10,000 years ago, and throw up a barrier to travel, perhaps a series of volcanoes on the Isthmus of Panama that would make further travel south unattractive to new comers. The humans already on South America would, by some mechanism to be discovered, diverge from the rest of the humans. This could be a characteristic that was submerged in the general population but, in isolation, became dominant.
What would it take for humans to split into two distinct species, unable to interbreed with each other?
I understand the two groups would have to be rather isolated from each other. For this I was suggest we look at a world ~10,000 years ago, and throw up a barrier to travel, perhaps a series of volcanoes on the Isthmus of Panama that would make further travel south unattractive to new comers. The humans already on South America would, by some mechanism to be discovered, diverge from the rest of the humans. This could be a characteristic that was submerged in the general population but, in isolation, became dominant.
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