Genetics Polygenic Traits

Polygenic traits in cannabis result from the combined effects of multiple genes, each contributing small additive effects to a single characteristic. Unlike monogenic traits controlled by a single gene, polygenic inheritance produces continuous variation across a population—such as plant height, leaf shape, flowering time, and cannabinoid ratios. Breeders working with polygenic traits face greater complexity in selection since traits don't follow simple dominant/recessive patterns. These characteristics typically show a bell-curve distribution within a breeding population, making them central to modern cultivar development. Understanding polygenic inheritance helps explain why identical genetics can express differently across environments and why stabilizing particular phenotypes requires multiple generations of selective breeding.

Breeders leverage polygenic trait understanding to refine desired characteristics through marker-assisted selection and multi-generational phenotype stabilization. This approach enables development of stable F1 hybrids and consistent commercial cultivars by identifying and combining favorable allele combinations across generations.