Inherent dangers

 
Last Updated: Saturday 04 July 2015

 So far so good (Credit: Advanced Cell Technologies)The hazards of cloning were revealed yet again after scientists in the us had to put to sleep one of two banteng calves they had cloned. The researchers took the step as the animal was "abnormally large". While the "healthy" calf was normal in size (20 kilogrammes or kg), the other one weighed about 36 kg.

Scientists at the us -based Advanced Cell Technologies cloned the calves from a banteng that had died more than 20 years ago. Bantengs, found in Asia, are an endangered species of wild cattle. The scientists said the attempt was part of a process to resurrect endangered animals through cloning.

The cloning technique entails the risk of creating an abnormal placenta -- the organ that hosts the developing embryo and foetus. Such an odd size usually results in fatal failures of the heart and other organs.

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