Genotypic Variance

Genotypic variance refers to the heritable, genetic differences in terpene expression across individual plants within a strain population. Unlike phenotypic variance (which includes environmental influences), genotypic variance reflects the underlying DNA-level diversity that determines baseline terpene profiles. Cannabis breeding programs frequently encounter genotypic variance when cultivating F1 or F2 generations, where offspring may exhibit noticeably different terpene compositions despite identical parentage. This trait is particularly relevant in modern seed production, where stabilization efforts aim to reduce unwanted variance in commercial cultivars. Understanding genotypic variance helps breeders predict offspring terpene consistency and informs selection strategies for desired aromatic profiles.

Breeders actively measure genotypic variance to identify which genetic markers correlate with stable, reproducible terpene expression. High genotypic variance in early generations signals the need for additional selection cycles to achieve phenotypic uniformity in finished strains.