In normal development, also, reprogramming has to occur. It occurs during egg maturation and sperm maturation. These are very complex processes, which takes years or months in humans. In clones, this nucleus comes in and now has to reprogram its genome probably with minutes, at most hours, because the egg has to divide. And that's where things go wrong.
Most clones die.
Scientists derided the assertions of Zavos and Boisselier that they could screen for abnormal embryos and prevent any defective ones from being implanted in the uteruses of surrogate mothers. And I think, what I appear to hear from them is, they are, they are ready to do this, because there is just no way to prescreen embryos for their defects. Most ethnicists who testified yesterday said that was only one of many reasons there should be explicit moves to block human reproductive cloning. To put it simply, whether or not you are the same person who cloned you, people will treat you that way. Whether or not you are the same as the person who clones you, you will look in age and succumbed to certain genetic problems that have afflicted your parent, and you may be able to have less of a life, less freedom, less opportunity to be who you want to be than we would normally say is appropriate for human beings.