Thc Dominant Biosynthesis

THC-dominant biosynthesis refers to the biochemical pathway and genetic expression in cannabis plants that preferentially produces tetrahydrocannabinol (THC) over cannabidiol (CBD). This trait is controlled by the CBDA synthase and THCA synthase enzymes, with specific alleles determining which cannabinoid predominates during flower development. Plants exhibiting THC-dominant biosynthesis typically produce minimal CBD, resulting in a cannabinoid profile skewed toward THC accumulation. Breeders have selectively worked with this trait for decades, establishing it as a primary classification marker in modern cultivar development. Understanding the genetic basis of THC-dominant biosynthesis is essential for breeding programs targeting specific cannabinoid ratios and for research into cannabinoid inheritance patterns.

Breeders working with THC-dominant lines use this trait as a foundational selection criterion, combining it with desirable terpene profiles, yield characteristics, and plant structure. Identifying and stabilizing THC-dominant genetics in F2 and F3 generations allows predictable cannabinoid expression across cultivar populations.