Short tandem repeats normally consist of repeating sequences of approximately how many bases ?
2 – 6
Short tandem repeats (STRs), or microsatellites, are regions of DNA in which a short core unit is repeated head-to-tail many times; the number of repeats varies between people and is the basis of DNA profiling.
The core repeat unit of an STR is about 2–6 base pairs long (di-, tri-, tetra-, penta- and hexanucleotide repeats). Forensic kits mainly use tetranucleotide repeats such as AGAT or TCTA because they show less stutter than di- or trinucleotide repeats.
Units of 10 or more bases fall under minisatellites (VNTRs, roughly 10–100 bp), while single-base runs are mononucleotide repeats and are not used as STR markers.
Hence, the answer is 2 – 6.
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