Genetic Sex Determination

Genetic sex determination in cannabis refers to the chromosomal mechanisms that establish male, female, or intersex phenotypes in dioecious (and sometimes monoecious) populations. Cannabis plants carry sex-linked genetic information, though environmental stress can sometimes trigger phenotypic sex reversal independent of underlying genotype. Understanding these mechanisms is central to breeding stable cultivars, as sex expression directly affects cannabinoid production, seed development, and crop planning. Researchers have identified sex-determining regions on cannabis chromosomes, though the complete genetic architecture remains an active area of study. Breeders working with regular seeds depend on recognizing and selecting for stable sex expression across generations.

Breeders exploit genetic sex determination to create feminized seed lines, select for female-only cultivars, or maintain stable dioecious landraces. Understanding sex genetics also helps predict intersex risk, manage breeding stock, and stabilize seed lines across environmental variables.