Just having an argument with a friend
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Sort of? They could start to repopulate the earth (depends on what pop level you consider “repopulated”) but with that little genetic diversity, it wouldn’t be long until they ran into problems associated with recessive genes coming out. Historically there was the famous Habsburg dynasty that suffered physical defects due to excessive inbreeding to the point where they could not live normal lives.
So basically, your new Adam and Eve would be fine, their kids would be fine, but their grandkids might start having issues, and their great-grandkids would almost certainly have serious issues.
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