Locus

Locus refers to the specific chromosomal location where a particular gene or trait is expressed in cannabis genetics. In breeding documentation, breeders map loci to track inheritance patterns of phenotypic characteristics—from cannabinoid ratios to terpene profiles to morphological features. Understanding locus positions helps breeders predict trait segregation across generations and identify markers associated with desired characteristics. Locus mapping has become increasingly relevant as cannabis genetics research advances, allowing breeders to work more deliberately with quantitative traits controlled by multiple genes. This foundational concept bridges classical Mendelian inheritance and modern marker-assisted selection practices in cannabis breeding programs.

Breeders use locus identification to accelerate selection for complex traits, particularly in stabilizing lines where multiple genes contribute to a single phenotype. Mapping trait-associated loci enables more informed parent selection and reduces the number of generations needed to fix desired characteristics in cultivar development.