Thc Dominant Phenotype

THC-dominant phenotype refers to cannabis plants expressing genetic potential favoring cannabinoid synthesis toward tetrahydrocannabinol (THC) over cannabidiol (CBD) and other minor cannabinoids. This phenotypic expression results from selective breeding practices spanning decades, where cultivators prioritized THC-producing biochemical pathways. The trait is inherited polygentially, meaning multiple genes regulate the cannabinoid synthase enzymes responsible for THC production. Modern lineage records frequently report THC-dominant phenotypes across most contemporary cultivars, particularly those developed in North American and European breeding programs since the 1980s. Understanding phenotypic expression versus genotypic potential remains important for breeders seeking to stabilize cannabinoid ratios across generations.

Breeders working with THC-dominant phenotypes use selective crosses to amplify desirable cannabinoid expression and stability across offspring. Phenotypic selection combined with genotypic testing helps establish true-breeding lines where THC dominance manifests consistently, reducing phenotypic variation in commercial seed populations.