About the consequences of errors in cloning, this is something really a serious problem! As mentioned by MG you need a very large number of surrogate mother to transplant the embryos. Before that you need a really large number of eggs (this is really a big problem in human) and the rate of successful transfer by SCNT is about 20% reported in human. Again when you transplant fertilized egg back into the surrogate mother uterus there also you have chances of getting error. And at last, there is always probability of getting erroneous chromosomal make up the cloned child. One particularly interesting aspect is Telomere shortening. This phenomenon is responsible for the pre-mature ageing and this phenomenon is frequently encountered in the cloned animals. Do you know Dolly was euthanized last year to relieve her from the unbearable pain she was experiencing. SO you know the health related problem associated with the cloned individuals is really a serious problem that scientists have to deal with in this decade. Nut