The Age of Cloning.

Some people think that the world is becoming a very different and dangerous place. Every day scientists improve the technique of cloning, making perfect copies of living creatures.
Maybe the most famous example was the world’s first clone, Dolly the sheep. She was born in 1997. The news made headlines across the world because many people had believed something as complex as a sheep could never be cloned. It took hundreds of attempts to produce Dolly and, even now, the cloning process is far from perfect.

In 2003, she died after developing a lung disease. Just over a year before she dead, she developed arthritis, a disease that could have been caused by the cloning process. Until then, she had seemed very well and had given birth to four healthy lambs. Scientist at the Roslin Institute say lung infections are common in older sheep, so her death may mean nothing at all.
Or, maybe it is significant.

This problem worries scientists because even clones which appear healthy may in fact have genetic abnormalities. Indeed, it seems that Dolly may have grown old prematurely. Under normal circumstances, sheep can live for 10 too 16 years so taken from 6 she was relatively young. She was created using DNA taken from a 6 years old sheep and for this reason she possibly aged faster than normal.