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I'm living proof of modern humans interbreeding with Neanderthals.
The fish are also sterile, which the company says would prevent interbreeding with wild salmon.
But on the issue of interbreeding with local populations, Dr. Cann seemed to avoid a direct comment.
Dr. Tishkoff's team interprets these divergent DNA sequences as genetic remnants of an interbreeding with an archaic species of human.
And the fish have to be killed to prevent interbreeding with the smaller stock of natural wild salmon.
Some subspecies from North America and Eurasia have also declined because of interbreeding with nonnative red deer subspecies.
"This might have indicated interbreeding with archaics," said Chris Stringer, a paleoanthropologist at the Natural History Museum in London.
This revealed that the Denisovans had genetic material in common with modern populations in Papua New Guinea, due to interbreeding with ancestors of the Melanesians.
By interbreeding with wild fish and outcompeting them for food and habitat, selectively bred salmon, environmentalists maintain, are changing the genetic composition of wild populations.
So where does this added complexity and evidence of interbreeding with Neanderthals and Denisovans leave my favoured Recent African Origins model?
This essentially still stands, even though the recovery of ancient Neanderthal sequences now suggests that there was some interbreeding with archaic groups along the way.
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