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Neurosurgeon Michael Egnor says it doesn’t happen because it can’t happen:
Three reasons why humans won’t be cloned: … 1. Biological: Reproductive cloning of non-human animals has become relatively routine and it works quite well. Reproductive cloning of human beings has been an abject failure, despite what are undoubtedly herculean efforts by some (probably many) labs. From a biological standpoint, there appears to be something radically different about cloning non-human animals and cloning humans. …
I am prepared to subject my belief that humans cannot be cloned like Dolly the sheep to the test
Both materialist and immaterialist theories of the mind should be subject to empirical testing—neither should be exempt.
vs.
Philosopher Jay Richards says it could happen but wouldn’t have the consequences Dr. Egnor thinks:
Jay Richards: I agree with Mike Egnor that the mind is immaterial but I don’t think human cloning is impossible
“Mike is right that scientists have had a harder time producing human clones than they have had with other organisms. But I don’t see any good reason—whether biological or metaphysical—to doubt that they will eventually succeed. But if and when they do, they will not have copied a person. They will, in effect, have produced a twin of a human being using biological precursors quite similar those that naturally give rise to a human being. And that twin will be less similar to the donor than two identical twins are to each other. After all, identical twins don’t just share DNA. They share the original ovum from their mother as well.”
There are, of course, empirical implications of both the materialist and non-materialist understanding of the human mind. But the success of human cloning won’t weigh on the question one way or the other.
See also: Are lab-grown human brains the Next Big Thing? Neurosurgeon Michael Egnor thinks the hopes for humanly conscious lab-grown brains are faint indeed.