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DNA Fingerprinting.
Member rating: No Rating | Words: | Submitted: Tue Mar 16 2004
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DNA Fingerprinting This is a way of making a pattern from pieces of DNA cut with restriction enzymes. Everybody has a different DNA, so the pattern or fingerprint is unique to each individual. DNA is a long chain, double-helix molecule composed of building units called nucleotides. Each nucleotide consists of a sugar, a phosphate and a nitrogenous base. There are four types of nitrogenous base: adenine, guanine, cytosine and thymine. The genetic information carried by a DNA molecule is contained in the sequence of these four bases. A gene is a length of DNA that codes for a specific protein or polypeptide. They are organised into chromosomes and located within the nucleus in human cells. Only 2% of the DNA of a human cell contains genes. The rest consists of non-coding sequences of bases called introns, which occur between or within a gene. Introns can be between 60 and 100 000...
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