Meaning of GENETIC MARKER

WordNet Dictionary
	Definition:		[n]  a specific gene that produces a recognizable trait and can be used in family or population studies
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	See Also:		factor, gene
Medical Dictionary
	Definition:		An identifiable substance that is associated with a normal or an abnormal gene.
Biology Dictionary
	Definition:		A gene which has an easily identifiable phenotype so that one can tell apart cells or individuals which have the gene and those which do not have it. Such a gene can also be used as a probe to mark cell nuclei or chromosomes so that they can easily be isolated or identified from other nuclei or chromosomes later.
Glossary
	Definition:		A gene or group of genes used to "mark" or track the action of microbes. A gene or other identifiable portion of DNA whose inheritance can be followed.