Thc Dominant Phenotype

THC-dominant phenotype refers to cannabis plants expressing biochemical profiles where tetrahydrocannabinol (THC) comprises the majority of total cannabinoids, with minimal CBD or other minor cannabinoids present. This expression pattern is shaped by genetic inheritance, environmental factors, and selective breeding practices over decades. Breeders working in this category often prioritize alleles associated with THC synthase enzyme activity while reducing cannabidiolic acid (CBDA) production pathways. THC-dominant plants are common in contemporary cannabis breeding lineages, particularly within North American and European cultivar development programs. Understanding phenotypic expression helps breeders predict offspring cannabinoid ratios and maintain consistent genetic libraries.

Breeders select for THC-dominant phenotypes through targeted crosses between established THC-rich parent lines and marker-assisted selection when available. Stabilizing this phenotype across generations requires consistent culling of CBD-expressing individuals and environmental standardization during cultivation.