Quantitative Inheritance

Quantitative inheritance in cannabis aromas refers to traits controlled by multiple genes rather than a single locus, resulting in a range of phenotypic expression rather than discrete categories. Aroma intensity, complexity of terpene profiles, and the proportion of dominant volatile compounds across a population commonly show this polygenic pattern. Breeders working in this category observe continuous variation in aromatic expression even among genetically similar siblings, reflecting additive gene effects. This contrasts with single-gene traits that produce clear Mendelian ratios. Understanding quantitative inheritance helps explain why aromatic expression can be unpredictable and why selective breeding for specific scent profiles requires multiple generations and careful line selection.

Breeders targeting specific aromatic goals use quantitative trait loci (QTL) mapping and multi-generational selection to shift population means toward desired terpene profiles. Phenotypic selection across large populations remains the primary practical method for stabilizing quantitative aroma traits in commercial breeding programs.