On a related note though, a friend of mine was telling me about a paper he read, through a news article, I think, about some experiments done in the 60s regarding digestion in relation to lifespan. This scientist used mice, he completely controlled their diet and only fed them the absolute essentials that their bodies needed. Of course changing whatever the nutrient was and tailoring each "meal" specifically for what they needed then and there. Basically, it prolonged their lives and the mice lived for a little over 20 years. They think it was because the body wasn't doing the constant work of digestion. Apparently the scientist tried it on himself as well and said the worst thing was, for the first year he was hungry all the time ... he didn't actually need food, his body had all the nutrients it needed, he was healthy and everything. It's actually very similar to what certain sections of the army do. They give specific rations based on your detail (at least the friend I talked to who was part of this) what eventually happened is they burned off all of what they ate. So, they basically stopped going number 2. There was no waste besides urine (Because you always drink more water then you need to stay hydrated)

I'm done now.

I don't think everyone has a firm grasp of molecular biology here.

A foreign chromosome would never be accepted, even if it's from another mammal. How is mitosis going to occur with an odd chromosome.

But even if someone can introduce a single gene, how do you get that gene expressed? How are you going to control the myriad transcription enzymes in the nucleus? We don't even know how to control the genes we already have, much less a foreign gene.