- The length of a nucleotide sequence that is repeated in a tandem cluster.
Definition from: Office of Rare Diseases
at the National Institutes of Health
- Multiple copies of the same base sequence on a chromosome; used as markers in physical mapping.
Definition from: Human Genome Project Information
at the U.S. Department of Energy
- A tandem repeat is a sequence of two or more DNA base pairs that is repeated in such a way that the repeats lie adjacent to each other on the chromosome. Tandem repeats are generally associated with non-coding DNA. In some instances, the number of times the DNA sequence is repeated is variable. Such variable tandem repeats are used in DNA fingerprinting procedures.
Definition from: Talking Glossary of Genetic Terms from the National Human Genome Research Institute
Related discussion in the Handbook
See also Understanding Medical Terminology.