Polygenic Traits

Polygenic traits in cannabis are characteristics controlled by multiple genes rather than a single locus, resulting in continuous variation across populations rather than discrete categories. Common examples include plant height, bud density, terpene profiles, and cannabinoid ratios—traits that typically show a range of phenotypes influenced by both genetic and environmental factors. Understanding polygenic inheritance is central to modern cannabis breeding, as it explains why crosses between two parents rarely produce uniform offspring and why selective breeding across generations gradually shifts trait distributions. Breeders working with polygenic traits must track performance across multiple generations to identify and stabilize desired combinations, unlike simple Mendelian traits controlled by one or two genes.

Breeders use polygenic selection strategies to stabilize complex traits like yield, potency, and flavor profiles across seed lines. Achieving consistency in polygenic traits requires multi-generational selection, backcrossing, or inbreeding protocols to reduce genetic variance and concentrate favorable allele combinations.