Faulty Genes Explain Why Cloning Is So DifficultMon May 27, 3:07 PM ETCloning may not always completely reprogramme an egg cell the way sexual reproduction does, which might explain why the process fails more often than it works, experts say. Dolly, the world's first cloned animal, stands in her pen at the Roslin Institute in Edinburgh in this February 23, 1997, file photo. REUTERS WASHINGTON (Reuters) - Cloning may not always completely reprogram an egg cell the way sexual reproduction does, which would explain why the process fails so often, researchers reported on Monday. While lawmakers around the world debate...