KEVIN CURTIS / SCIENCE PHOTO LIBRARY KEVIN CURTIS / SCIENCE PHOTO LIBRARY
DNA analysis, negative image. Graph showing the results of DNA (deoxyribonucleic acid) sequencing twisted into a helix. A DNA molecule consists of two sugar-phosphate backbones, arranged as a double helix, joined by nucleotide bases. There are 4 types of nucleotide base; adenine (A), cytosine (C), guanine (G) and thymine (T). Sequences of these bases make up genes, which encode an organism's genetic information. Uses of DNA sequencing include; finding genes responsible for disease, DNA fingerprinting and paternity testing.
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