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This would be done by taking the nucleus from a fertilised egg of a woman with these defects and putting it into the fertilised egg of a healthy woman from which the nucleus has been removed. The mother and father, then, would be the main parents, because the nucleus carries the genes that affect things like looks, so the offspring would look like them, not like the third parent who provides the rest of the egg.
A neat mechanical solution to a heart-rending condition; what’s not to like...