MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY
Human cloning. Conceptual image representing human cloning showing a row of identical dolls. Cloning is the process by which a genetically-identical copy of an organism is made. In the laboratory, a human clone could be made by extracting the DNA genetic material from one of the subject's cells, and placing it into the nucleus of a human egg cell. The cell would then develop normally into a clone of the subject. Natural identical twins are also genetic clones, being the product of the division of a fertilised egg in the mother's body.
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