Polygenic Traits

Polygenic traits in cannabis refer to characteristics controlled by multiple genes rather than a single gene, resulting in continuous variation across populations. Height, leaf morphology, cannabinoid ratios, and terpene profiles are commonly polygenic, meaning expression falls along a spectrum rather than showing discrete categories. This contrasts with monogenic traits (controlled by one gene), which produce more predictable, binary outcomes. Understanding polygenic inheritance is essential for breeders working to stabilize desired phenotypes, as these traits require multi-generational selection and careful line-breeding practices. Environmental factors further complicate expression, making consistent polygenic trait reproduction challenging across growing conditions.

Breeders targeting polygenic traits employ backcrossing, phenotypic selection across generations, and population-wide screening to gradually shift trait expression toward desired outcomes. This approach requires larger sample sizes and longer breeding timelines compared to monogenic trait selection.