Quote Originally Posted by EdgeTW View Post
Actually, I don't think it's possible. I think they discussed this specifically at some point, that the species were not compatible for cross breeding, and that Amanda's comment about Irissa looking pureblood was more about being confused by Nolan's comment (about Irissa being his daughter) and not a statement meant to imply that halfbreeds actually exist.

Which seemed like kind of a weak excuse to me, but there it is.
Same here, but there was already a thread on this somewhere. The fact that they even look remotely human suggests "panspermia" and should mean compatibility. But w/e, it's a sci-fi show, we kind of expect some deus ex machina.