Polygenic Trait Selection

Polygenic trait selection refers to breeding strategies targeting characteristics controlled by multiple genes rather than single-gene traits. In cannabis cultivation, traits like cannabinoid ratios, terpene profiles, plant height, and flowering time are commonly polygenic, meaning their expression results from cumulative effects across numerous loci. Breeders working with polygenic traits face increased complexity compared to monogenic selection, as environmental factors interact with genetic variation to produce phenotypic outcomes. Understanding polygenic inheritance is foundational to modern cannabis genetics, as most commercially relevant traits—including aroma complexity, resin production, and growth vigor—operate under this model. Selection across generations requires larger population sizes and careful phenotyping to identify individuals expressing desired trait combinations.

Breeders employ polygenic selection through multi-generational stabilization, phenotypic screening of large cohorts, and marker-assisted selection to accelerate trait fixation without expanding grow space. Understanding polygenic architecture helps explain why certain aroma or cannabinoid profiles require sustained breeding effort and why F1 hybrids often show trait heterogeneity that stabilizes o