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(1992) At Cambridge University, Bill Amos prepares sloughed sperm whale skin collected off of the Azores Islands in England. The skin is then DNA analyzed to study relationships among the whale population. DNA consists of two sugar- phosphate backbones, arranged in a double helix, linked by nucleotide bases. There are 4 types of base; adenine (A), cytosine (C), guanine (G) and thymine (T). Sequences of these bases make up genes, which encode an organism's genetic information. DNA Fingerprinting. MODEL RELEASED