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What is a Locus?

April 26, 2017locus

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What is a Locus?

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The position on a chromosome of a gene or other chromosome marker; also, the DNA at that position. The use of locus is sometimes restricted to mean expressed DNA regions.

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Loucs come from the Latin word for ‘place’. When testing participants’ Y-DNA, the lab examines the same locations in the Y-DNA sequence for everyone. These locations are called loci.(Locus is singular whereas Loci is plural) You can have 12 loci tested, 25 loci tested, 37 loci tested or 67 loci tested. Whichever test you have, those same locations will be tested for everyone who chooses that same test.