Final answer:
QTLs are regions of the genome associated with quantitative traits and are identified using genomics and genetic mapping techniques.
Step-by-step explanation:
Quantitative Trait Loci (QTLs) are regions of the genome that are statistically associated with a phenotype. They are not the exact genes themselves but rather areas within the genome that correlate with variation in a quantitative trait, such as height or skin color.
These traits are typically influenced by multiple genetic and environmental factors, rather than a single gene. QTLs help scientists to identify potential candidate genes that contribute to a trait. Comprehensive studies facilitated by genomics and genetic mapping provide insights into QTLs. Tools such as Single Nucleotide Polymorphism (SNP) analysis are used to detect QTLs, which are also valuable for constructing genetic maps using markers that show variability in a population.