marker locus

mark·er lo·cus

a locus on a chromosome or in a stretch of DNA that can be identified (for example, a restriction fragment length polymorphism) and can serve in linkage analysis and in the isolation of a disease gene.
See also: linkage marker.
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This software assumes a model in which there are K populations (clusters) that contribute to the genotype of each individual and are characterized by a set of allele frequencies at each marker locus.
Patients with a homozygous mutation may not have the same allele size at the selected marker locus if the 2 mutant alleles do not have a common origin (3).