Final answer:
QTL mapping can tell us both the number of loci that influence a quantitative trait and the location of QTL in the genome.
Step-by-step explanation:
Quantitative trait locus (QTL) mapping can tell us both the number of loci that influence a quantitative trait and the location of QTL in the genome. QTL mapping is a technique used to identify specific regions of a genome that are associated with variation in a quantitative trait. This information can be used to understand the genetic basis of complex traits and can help in breeding programs to improve desirable traits in plants and animals.