What Happens When You Swap a Human Gene With a Neanderthal’s?

Now that we’ve gotten a look at the genomes of archaic humans, researchers are trying to determine whether our differences are due to genetics. 

What are the key differences between modern humans and our closest relatives, the Neanderthals and Denisovans? For the Neanderthals, there doesn’t seem to be any sort of obvious difference. They used sophisticated tools, made art, and established themselves in some very harsh environments. But, as far as we can tell, their overall population was never particularly high. When modern humans arrived on the scene in Eurasia, our numbers grew larger, we spread even further, and the Neanderthals and Denisovans ended up displaced and

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