Polygenic Inheritance

Polygenic inheritance describes how multiple genes across different chromosomal locations contribute to a single trait—such as aroma profile, plant height, or resin production. In cannabis breeding, complex aromatic compounds like terpene expression patterns are often controlled by many genes working together, rather than a single dominant or recessive locus. This genetic architecture means aroma phenotypes can vary considerably even within a single cross, and selective breeding for specific scent profiles requires multiple generations to stabilize desired traits. Breeders working with polygenic traits typically employ progeny testing and backcrossing strategies to identify and concentrate favorable allele combinations. Understanding polygenic control is essential for developing stable cultivars and predicting offspring variation.

Breeders targeting consistent aroma outcomes must account for polygenic effects, which produce continuous variation rather than discrete categories. Multiple selection cycles and careful pedigree tracking help isolate genetic backgrounds that reliably express desired terpene profiles.