Type 1 Thc Dominant

Type 1 THC-dominant plants represent cannabis lines where cannabinoid expression favors THC synthesis over CBD, a classification based on cannabinoid ratios rather than absolute potency levels. This phenotypic category emerged from breeding work in the 1970s-1980s as cultivators selectively propagated plants showing higher THC/CBD ratios. Lineage records frequently report Type 1 expression across diverse chemovars, including classic heritage strains and modern crosses. The genetics underlying this trait involve multiple genes regulating the CBDA synthase and THCA synthase enzymatic pathways, making Type 1 expression a polygenic characteristic. Breeders working in this category typically employ marker-assisted selection and progeny testing to stabilize THC-dominant ratios across generations. Understanding Type 1 classification remains foundational to modern cannabis breeding nomenclature

Breeders targeting THC-dominant cultivars use Type 1 classification to identify parent material and predict cannabinoid phenotypes in F1 and F2 generations. Stabilizing Type 1 expression requires multi-generational selection, as heterozygous loci can segregate toward CBD-dominant or balanced ratios in subsequent crosses.