Sex Determination

Sex determination in cannabis refers to the genetic and environmental mechanisms that influence whether a plant develops as male, female, or hermaphroditic. Cannabis is typically dioecious, meaning individual plants express either male or female reproductive organs, though environmental stress can trigger hermaphroditic expression in phenotypically female plants. Understanding sex determination is foundational to breeding programs, as female plants produce the resinous flower sought in cultivation, while males contribute pollen for creating new genetic lines. Breeders have long observed that sex expression involves both chromosomal inheritance (XY systems proposed in research) and epigenetic factors responsive to light, temperature, and nutrient availability. Feminized seed technology emerged from deliberate induction of hermaphroditism in female plants to reliably produce all-female off

Breeders leverage sex determination knowledge to develop feminized seed lines, select for stable female phenotypes in breeding stock, and create male plants with desirable secondary traits for controlled crosses. Understanding the genetic basis of sex also helps breeders stabilize lines and predict offspring ratios in hybrid development.