Human cloning the end of the human race or the beginning of a new one?

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This is an offshoot of the stem cell research issue. You may remember the sheep named Dolly that was cloned years ago. What most people don't know is that Dolly's "mother" was a genetically enhanced with human DNA. So in a way it was a partial human clone. There was also a religious/sci-fi cult that claims to have cloned a human being a few years back. Some people fear that this will spur a resurgence of the eugenics movement and that parent will eventually want their kids genetically altered for the best traits (similar to the movie Gattaca). The dangers in this is that with the hand full of knowledge scientist have they are ready to alter human destiny without thinking of the long term effects of what might happen in eliminating some of these so called useless genes that might actually have a purpose. Also there is the question of ethics in all this. What is the limit of how far one can go since Dolly had human gene what if you wanted you kids to have genes of a lion would they still be considered human by appearance alone? If this gene mixture happens would they be considered pets instead of humans? Or would they be allowed to breed with other humans spreading their genes into the human gene pool. It does take much foresight to see that some doors should be left closed and that things like these experiments shouldn't be allowed to happen but of course there is always the possibility that their are rouge scientist out there that have already opened the lid on Pandora's box. Whats your opinion?