Thc Dominance

THC dominance refers to cannabis plants where tetrahydrocannabinol (THC) comprises the majority of the total cannabinoid profile, with minimal CBD or other minor cannabinoids present. This classification emerged from selective breeding practices beginning in the 1970s-1980s, when cultivators prioritized THC accumulation over balanced cannabinoid ratios. Lineage records frequently report that modern commercial cultivars display THC-dominant profiles, often ranging from 15-30%+ total THC by dry weight, while CBD typically remains below 1%. Breeders working in this category often select parent plants exhibiting high THCa synthase enzyme activity and lower CBDa synthase expression. Understanding cannabinoid dominance patterns is essential for breeding programs, as chemotype inheritance follows predictable genetic pathways tied to specific enzymatic genes.

Breeders use THC dominance as a primary selection criterion to stabilize potency traits across generations. Identifying and backcrossing plants with consistent THC-dominant expression helps establish true-breeding lines where cannabinoid ratios remain stable in offspring.