A locus is the specific location or position of a gene, DNA sequence, on a chromosome, in the field of genetics.
Locus. Definition. noun, plural: loci. (general) A place, space or locality, especially a centre of an activity. (mathematics) The set of all points whose coordinates satisfy a given equation or condition. (genetics) The location of a gene (or of a significant sequence) on a chromosome, as in genetic locus. (medicine) The site on the body where a pathogen enters. Supplement A locus is the specific physical location of a gene or other DNA sequence on a chromosome, like a genetic street address. The plural of locus is loci.  Full Definition of LOCUS. 1. 2. : the set of all points whose location is determined by stated conditions. 3. : the position in a chromosome of a particular gene or allele. See locus defined for English-language learners. See locus defined for kids.  Supplement. 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.  allele, allelomorph - (genetics) either of a pair (or series) of alternative forms of a gene that can occupy the same locus on a particular chromosome and that control the same character; some alleles are dominant over others. A segment of DNA, occupying a specific place on a chromosome, that is the basic unit of heredity. Genes act by directing the synthesis of proteins, which are the main components of cells and are the catalysts of all cellular processes. gene. A segment of DNA, occupying a specific place on a chromosome, that is the basic unit of heredity. Genes act by directing the synthesis of proteins, which are the main components of cells and are the catalysts of all cellular processes. Example of bands. A locus (plural loci) is the specific location or position of a gene, DNA sequence, on a chromosome, in the field of genetics. Each chromosome carries many genes; humans' estimated ' haploid ' protein coding genes are 20,000-25,000, on the 23 different chromosomes. For example, the locus of gene OCA1 may be written 11q1.4-q2.1, meaning it is on the long arm of chromosome 11, somewhere in the range from sub-band 4 of region 1 to sub-band 1 of region 2. The ends of a chromosome are labeled pter and qter , and so 2qter refers to the terminus of the long arm of chromosome 2
http://www.biology-online.org/dictionary/Locus http://ghr.nlm.nih.gov/glossary%3Dlocus http://www.merriam-webster.com/dictionary/locus http://www.biology-online.org/dictionary/Genetic_locus http://www.thefreedictionary.com/Gene+locus http://www.thefreedictionary.com/Gene+locus https://en.wikipedia.org/wiki/Locus_(genetics)
definition of gene locus