Term Name:	QTL
Synonyms:	quantitative trait locus
Definition:	A quantitative trait locus (QTL) is a polymorphic locus which contains alleles that differentially affect the expression of a continuously distributed phenotypic trait. Usually it is a marker described by statistical association to quantitative variation in the particular phenotypic trait that is thought to be controlled by the cumulative action of alleles at multiple loci.
Ontology:	Sequence Ontology [SO:0000771]