Cloning is the recreation of an organism that is exactly the same. In order for anything to be a clone, every bit of DNA has to be the same. Dolly the sheep is famous for being cloned. This means that there is a sheep that is just like her, it has every single bit of DNA that she has. The most common process of cloning is called "nuclear transfer," and it requires two types of cells. The first one is a somatic cell, and the other one is an unfertilized egg from another sheep. Usually an egg has DNA from the female sheep, but to make it a clone only DNA from one sheep is required. Therefore, scientists has to clean out all the DNA from the unfertilized egg to make it a clone from only one sheep.
Other types of cloning are DNA cloning, and therapeutic cloning.
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