QTL is the abbreviation of Quantitative Trait Loci and the region on the chromosome which influences Quantitative Trait. The procedures for finding and locating QTLs are called QTL mapping.

• QTL是数量性状基因位点(Quantitative trait loci)的英文缩写，是位于染色体的上影响数量性状的一些区域，利用特定的遗传标记可以确定某一性状的QTL在染色体上的数目、位置及其遗传效应，这就是QTL作图。