In recent years, some scientists have argued that such selfish genetic elements serve the greater good in the long run by making species more "evolvable, " like insects, and that this explains their existence.

WSJ: Matt Ridley on Selfish DNA | Mind & Matter

So while any baby born through this method would have genetic elements from three people, the nuclear DNA that influences appearance and other characteristics would not come from the woman providing the donor egg.

BBC: RELATED BBC SITES