Locus
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Locus (medicine)
Locus (pronounced: LOH-kus, from Latin locus meaning "place") is a term used in medicine and genetics to describe a specific location or position on a chromosome where a particular gene or genetic marker is located.
Etymology
The term locus is derived from the Latin word for "place". In the context of genetics, it refers to the specific location of a gene or DNA sequence on a chromosome.
Related Terms
- Allele: An allele is one of two or more versions of a gene that are found at the same locus on a chromosome.
- Genotype: The genotype is the set of genes in an organism's DNA responsible for a particular trait, which are found at specific loci on chromosomes.
- Phenotype: The phenotype is the physical expression, or characteristics, of that trait, determined by the combination of alleles at the relevant loci.
- Polymorphism: Polymorphism in biology and genetics is the occurrence of two or more clearly different forms, called phenotypes, in the population of a species. To be classified as such, morphs must occupy the same habitat at the same time and belong to a panmictic population (one with random mating).
- Genetic linkage: Genetic linkage is the tendency of DNA sequences that are close together on a chromosome to be inherited together during the meiosis phase of sexual reproduction.
See also
External links
- Medical encyclopedia article on Locus
- Wikipedia's article - Locus
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