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From Wikipedia, the free encyclopedia. Short tandem repeat analysis (STR) is a molecular biology method used to compare specific loci on DNA from two or more samples.A short tandem repeat is a microsatellite, consisting of a unit of two to thirteen nucleotides repeated hundreds of times in a row on the DNA strand.STR analysis measures the exact number of repeating units.TR analysis is a tool in forensic analysis that evaluates specific STR regions found on nuclear DNA. The variable (polymorphic) nature of the STR regions that are analyzed for forensic testing intensifies the discrimination between one DNA profile and another.
A Y-STR is a short tandem repeat (STR) on the Y-chromosome. Y-STRs are often used in forensics, paternity, and genealogical DNA testing.Y-STRs are taken specifically from the male Y chromosome.hese regions, called âvariable number short tandem repeatsâ are what is looked at when performing STR analysis. The likelihood of two people having the same number of repeated sequences is extremely small, and becomes even smaller the more regions that are analyzed.