Plants, single celled organisms and and a few animals (e.g. sea urchin) use asexual reproduction to make exact genetic copies of themselves. These exact copies are called clones. Humans have been cloning plants for centuries by taking cuttings and scientists succeeded in cloning a frog in 1958. This was followed by clones of fish in the 1960s and 1970s but it wasn't until 1997 that the first large animal, a sheep called Dolly, was cloned. Since then, other large animals have also been cloned, including pets. As the technique has been developed, it has been possible to combine cloning with... Show more

Plants, single celled organisms and and a few animals (e.g. sea urchin) use asexual reproduction to make exact genetic copies of themselves. These exact copies are called clones. Humans have been cloning plants for centuries by taking cuttings and scientists succeeded in cloning a frog in 1958. This was followed by clones of fish in the 1960s and 1970s but it wasn't until 1997 that the first large animal, a sheep called Dolly, was cloned. Since then, other large animals have also been cloned, including pets. As the technique has been developed, it has been possible to combine cloning with genetic engineering

There are two main techniques of large animal cloning. The first involves separating the stem cells (cells which have not yet become specialised) of a naturally fertilised embryo and implanting the individual cells into a host mother. The second involves removing the nucleus from an unfertilised egg cell and replacing it with the nucleus from a donor animal.

It would be possible to create human clones in the same way but there are many ethical issues. You should know the pros and cons of human cloning and understand the issues and offer arguments from both sides.

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