noun, plural: genetic markers
A gene or (a fragment of) DNA sequence having a known location on a chromosome, has an easily identifiable phenotype and whose inheritance pattern can be followed.
Genetic markers act as chromosomal landmarks. They are used to trace or identify specific region of a gene (especially one that is associated with an inherited disease) on a chromosome. They are also used to determine a linkage group or a recombination event.
Also called: marker, marker gene, DNA marker.
See also: genetic map.