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Identification based on a person's unique genes. 'The science of human DNA is highly complex and difficult to understand, even for the well educated and patient student. It involves the matching of human genome materials or alleles and a statistical calculation of how often that match might occur in a chosen population.' The science of DNA testing has been described as follows: An allele is any alternative form of a gene that can occupy a particular chromosomal locus. In humans and other diploid organisms there are two alleles, one on each chromosome of a homologous pair. Forensic DNA tests compare allele combinations at loci ...