Polygenic Traits

Polygenic traits in cannabis are controlled by multiple genes working together, rather than a single dominant or recessive gene. These traits include plant height, flowering time, resin production, and terpene profiles. Polygenic inheritance creates a spectrum of expression rather than distinct categories—plants may show intermediate or variable phenotypes even within the same cross. Understanding polygenic architecture is central to modern breeding work, as most commercially relevant characteristics (yield potential, cannabinoid ratios, aroma diversity) involve dozens or hundreds of genetic loci. Breeders use selection across multiple generations to stabilize desired polygenic combinations, though expression remains influenced by environmental factors like light, temperature, and nutrient availability.

Breeders working with polygenic traits employ continuous selection and backcrossing strategies over many generations to achieve desired phenotypic ranges. This approach underpins development of stable cultivar lines where multiple desirable traits are consolidated, though full homozygosity at all loci remains impractical, resulting in some phenotypic variation in commercial seed lines.