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  • Current: Nov 27, 2020

Locus (loci)

A locus is a position of a particular gene on a chromosome.

Typical diploid cells have two same loci on homologous chromosomes. Two alleles, one from each parent, occupy the loci.

Allele and locus

Definitions in the literature

  • Position on a chromosome where a specific gene is located [1].
  • The position of a gene on a chromosome or within a nucleic acid molecule. The alleles of a gene occupy the same locus on homologous chromosome [2].
  • The physical location of a gene on a chromosome [3].