DAVID PARKER / SCIENCE PHOTO LIBRARY DAVID PARKER / SCIENCE PHOTO LIBRARY
Analysis of DNA fingerprints at ICI Cellmark Diagnostics, Oxfordshire. Two technicians are working with X-rays (or autoradiographs) of bands of DNA produced by the technique of electrophoresis in an agarose gel. The pattern of these DNA bands is unique to each individual, but some bands are shared by related people, such as a parent & child. The workers are identifying bands common to mother and child (in red), and father and child (in blue). DNA fingerprints can be used to prove conclusively whether people are related, for instance in cases of disputed paternity, or where immigrants to a country need to prove a family relationship.
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