Big difference "The twist would be to decide, on the basis of their dna, which of a group of available embryos should be implanted and brought to term." In th

Big difference "The twist would be to decide, on the basis of their dna, which of a group of available embryos should be implanted and brought to term." In this case you are deciding which group of cells to implant. In your examples you are effecting a specific person. Not choosing them out of a group and discarding the others. Personally I don't know. But your comparison isn't fair.