This is a term from genetics, which describes a patterns that help determine an individual's inherited traits.
Tandem repeats and variable number tandem repeats in DNA are two or more nucleotides in a pattern which are directly adjacent to each other. An example would be:
ATTCGATTCGATTCG
Tandem repeats can be very useful in determining parentage.
DNA is examined from microsatellite within the chromosomal DNA. Minisatellite is another way of saying special regions of the loci. Polymerase chain reaction (or PCR) is performed on the minisatellite areas. The PCR must be performed on each organism being tested. The amplified material is then run through electrophoresis. By checking the percentage of bands that match, parentage is determined.
Tandemrepeats are an array of consecutive repeats.
Its repeat unit is 171 bp and the repetitive region accounts for 3-5% of the DNA in each chromosome.
Microsatellites are also known as short tandemrepeats (STR), because a repeat unit consists of only 1 to 6 bp and the whole repetitive region spans less than 150 bp.
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