DNA sequencing. Gloved hand and a magnifying glass on the banded DNA sequences or genetic fingerprints of an autoradiogram. The pattern of bands repre

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DNA sequencing. Gloved hand and a magnifying glass on the banded DNA sequences or genetic fingerprints of an autoradiogram. The pattern of bands represents the chemical sequence that forms the genetic code for a section of DNA (deoxyribonucleic acid). The DNA sample was cut into fragments by an enzyme and marked with radioactive tags. These fragments were then placed in a gel and separated by electrophoresis, the application of an electric charge. An autoradiogram of the resulting bands of radioactively-tagged DNA was made using radiographic film. DNA sequencing is used in forensic science, medical research and genealogy.

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Photo credit: © TEK IMAGE/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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