noun, plural: genetic loci
The location of a gene (or of a significant sequence) on a chromosome or on a linkage map.
For example, the locus of the gene OCA1 (or Oculocutaneous Albinism Type 1, the gene associated with albinism) is on 11q1.4-a2.1, which means it is on the long arm of chromosome 11, between sub-band 4 of band 1 to sub-band 1 of band 2.
Word origin: locus » Latin stlocus, a place.
Also called: gene locus.
See also: allele.