genetic marker(n = noun.body) - a specific gene that produces a recognizable trait and can be used in family or population studies;
is a kind of cistron, factor, gene

billiard marker, genetic, genetic abnormality, genetic code, genetic constitution, genetic counseling, genetic defect, genetic disease, genetic disorder, genetic endowment, genetic engineering, genetic fingerprint, genetic fingerprinting, genetic map, genetic mutation, genetic profiling, genetic psychology, genetic science, genetic screening, magic marker, marker, yard marker