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<p>trait loci (QTLs) that takes advantage of historic linkage disequilibrium to link phenotypes (observable characteristics) to genotypes (the genetic constitution of organisms), uncovering genetic associations.</p>

<p><big> Nomenclature </big></p>
<p>The shorter arm of a chromosome is termed the <b>p arm</b> or <b>p-arm</b>, while the longer arm is the <b>q arm</b> or <b>q-arm</b>. The chromosomal locus of a typical gene, for example, might be written 3p22.1, where:<br/>
* 3 = <a href="page.php?w=chromosome_3_%28human%29">chromosome 3</a><br/>
* p = p-arm<br/></p><p>
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