Molecular Phenotype

Molecular phenotype refers to the observable chemical profile of a cannabis plant—the specific terpenes, cannabinoids, and flavonoids expressed in its tissues. This profile results from genetic potential (genotype) interacting with environmental factors like temperature, light, soil composition, and harvest timing. Breeders and cultivators track molecular phenotypes to identify stable, reproducible chemotypes across seed batches. Understanding molecular phenotype is foundational to selective breeding, as it allows distinction between plants carrying identical genetics that express different chemical outputs. Documentation of molecular phenotype typically involves gas chromatography or similar analytical methods to quantify terpene and cannabinoid ratios.

Breeders use molecular phenotype data to select parents with consistent, desirable chemical profiles and to identify which environmental variables most influence expression. Stabilizing a specific molecular phenotype across a seed line requires multiple generations of selection for plants that reliably produce the same terpene and cannabinoid ratios under standard conditions.