Scientists at Harvard are reverse engineering chicken DNA to make dinosaurs. Well, sort of. But they can’t actually hatch the part-dino embryos because of some ethics restrictions. Why is hatching a genetically altered chicken with an alligator-like snout an ethical problem?
Smiling Doom 
I’m pretty sure it’s not so much an ethical problem as it is a public relations problem. I mean, just look at the way that people respond to the idea of genetically modified food, for example. Although there is zero danger involved, the scientifically ignorant insist eating GMO corn will cause them to grow a third eye or something. They fail to realize that all agriculture amounts to is gradual genetic modification over the centuries. Following the logic that it is “unethical” to bring a gator-beaked chicken into the world, should we likewise screen for genetic abnormalities in humans and terminate “abnormal” embryos. I don’t know. Maybe? Yet again, that seems to be more a matter of perception than anything else.