Unisexual organisms can only ever generate one type of gamete, never both male and female gametes. Humans, for instance, are unisexual organisms since they are separated into males and females.
Unisexual living beings are tracked down in sexually open species, where an individual has just a single kind of sex (either male or female) cells.
Unisexual living beings can frame a solitary kind of sex gametes yet never can deliver both the sex gametes.
Unisexual biological organisms are living beings that only address single-sex issues and create single-sex gametes. It's a similar situation to dioecism in plants.