Marker gene

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noun, plural: marker genes

(genetics) A gene with known physical location, easily detectable phenotype, and whose pattern of inheritance can be followed.


These markers are used to trace or identify specific region of a gene (especially one that is associated with an inherited disease) on a particular chromosome. These markers can be an enzymatic reporter gene, a selectable marker conferring antibiotic resistance or a cell membrane protein with a characteristic epitope.

Also called: genetic marker, DNA marker.
See also: genetic map.