Sex Determination Genetics

Sex determination in cannabis involves genetic mechanisms that breeders must understand to manage dioecious (separate male/female) plants. The species exhibits chromosomal sex determination, though environmental factors can influence phenotypic expression in some cases. Breeders working with traditional photoperiod cultivars must identify and remove male plants to prevent pollination, or deliberately maintain males for breeding programs. Hermaphroditism—the expression of both male and female reproductive organs—can occur due to genetic predisposition or stress conditions, and understanding these triggers is central to stable cultivar development. Documented lineage records show variation in sex stability across strain families, making this trait important for seed production and clone-based cultivation strategies.

Breeders select for genetic stability in sex expression to produce reliable all-female seed populations or maintain pure breeding lines. Understanding sex determination helps developers create feminized seed stock and identify hermaphroditic tendencies in particular crosses or environmental responses.