See also: Locus (homonymy)
A Locus defines a precise and invariable site on a Chromosome; and by extension the factorial chart the representative. A locus can contain a Gène but not necessarily. Allèle and locus should not be confused. An allele is a " version" of a gene and can find itself at various places on the same chromosome and even on a different chromosome (duplication and transposition). A locus is a sequential fragment invariant: for example one can decide to be interested in the locus 6p21.3. The 6 indicates the 6th pair of chromosomes; the p indicates that it is located on the arm court of the chromosome and the 21.3 reveals the exact position of the locus compared to the end of the télomère. For the plural of locus, it is current to use the word loci .
A locus for quantitative purposes (summary in QTL for quantitative milked locus) is a locus where the allelic variation is associated with the variation of a quantitative nature. The presence of a QTL is deduced from the genetic cartography, where the total variation is divided into parts related to a number of distinct chromosomal areas.
A locus of characters of economic interest (shortened in LTE for economic milked locus) is a locus having an influence on a character and contributing to the income of the producer.
The Logarithm of the report/ratio of the probability of connection between two loci under an assumption θ of connection, with the assumption of independence (θ = 1/2), often named Lod score, is used to estimate the distance between two dependant genes on the same chromosome.
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