What are Feminized Seeds, really? From a FEM breeders point of view, they’re 99% female stock, some even claim 100% from seed. If you ask a genealogist they will tell you that female plants chromosomes are XX. A male plant has XY. A hermaphrodite has XXY. When you force a XX female plant to artificially produce pollen whether natural, forced, or by chemical, it will produce male sex parts that release XXY pollen. The extra Y chromosome is added to the female XX to make, mostly XX (female) seeds, but with recessive XXy genes also. This extra (y) cannot be bred out. Bad, or in-consist indoor environments will trigger this hermaphrodite tendency to surface quickly.