Additive Genetic Variance

Additive genetic variance describes the cumulative effect of multiple genes, each contributing small, independent increments to a trait's expression in cannabis. Unlike single-gene traits with dominant/recessive patterns, additive traits (such as plant height, leaf width, or cannabinoid potency) show continuous variation across populations. Breeders observe this as a bell-curve distribution of phenotypes rather than discrete categories. Lineage records frequently report that height, yield potential, and terpene intensity follow additive inheritance patterns, making them responsive to selective breeding across generations. Understanding additive variance is essential for developing stable cultivars, as these traits require consistent selection pressure rather than simple Mendelian crosses.

Breeders leverage additive genetic variance by selecting parent plants across multiple generations for cumulative trait improvement. This approach underpins development of cultivars with targeted cannabinoid profiles, plant architectures, or flowering time ranges.