I think this is a very controversial topic. Anything to do with using
humans in experiments is a touchy subject. I believe that human embryos
are humans and therefore I don't believe they should be used in these
experiments any more than a full grown human should be used in an
experiment.
In the case of defective embryos, I would say that it would be okay to
use them if they are expected to die for sure. But then, how would you
know what would happen with a normal embryo? So the experiment couldn't
be totally conclusive.
