Genotype Phenotype Interaction

Genotype-phenotype interaction describes how a cannabis plant's genetic blueprint (genotype) expresses visibly and biochemically (phenotype) under specific environmental conditions. The same genetics can produce notably different plant structures, cannabinoid profiles, and terpene distributions depending on light, temperature, humidity, and soil composition. This interaction is central to breeding programs, as breeders must evaluate cultivars across multiple environments to accurately assess genetic stability. Understanding these interactions helps distinguish true genetic traits from environmental artifacts, which is critical for seed selection and strain documentation. Phenotypic plasticity—the ability of one genotype to express multiple phenotypes—complicates standardization but also reveals adaptive potential in breeding lines.

Breeders track genotype-phenotype interactions through multi-environment trials (METs) to identify which traits are stably inherited versus environment-dependent. Selecting for consistent expression across varied conditions produces more reliable, predictable cultivars for seed production and commercial propagation.