It is not fully understood why survival and development is affected by cloning
Because God is trying to stop it! He is doing everything within his power to derail this godless behaviour for our own good! And if you do not stop you will soon enough feel his wrath!
http://en.wikipedia.org/wiki/Telomere#Lengthening_telomeres When you clone an animal, you take it's telomere length along with its DNA. The shortened telomeres provide a shorter life span. This can be observed in the case of Dolly, the cloned sheep. http://en.wikipedia.org/wiki/Dolly_(sheep)#Death' Where is your god now?