(QTL). A genetic locus or chromosomal region that contributes to variability in complex quantitative traits (such as height or body weight), as identified by statistical analysis. Quantitative traits are typically affected by several genes and by the environment.
The set of genes that governs the quantity of a trait that is not completely determined by any one gene acting alone.
The chromosomal location of one of a set of genes that collectively encode a quantitative trait that varies continuously across a population.