A clone is an exact copy of another animal. Scientists have cloned a sheep which they have named Dolly, and this sheep is now famous all over the world. These scientists also used human genes to clone a lamb named Polly. One reason is to get information about genes so they can improve our health. They also want to learn how better farm animals can be produced.
Cloning is a controversial issue for people.
Some people think it is good because this research can help us, but other people think cloning is unnacceptable. Some people want to ban cloning because they are afraid scientists will try to clone human beings. They don't think it is right to make duplicates of people. In fact, some countries have banned human cloning.