I kept a salt water reef tank for years and it always had clownfish in it. They are fascinating to watch as they dive into their anemone. Once you introduce a second clownfish into the tank, one of them becomes the male. And it grows proportionately. And if you have several clownfish and the only male dies, one of the females will transition.
Back in the early days I also used to grow marijuana. That too is transgender. As any knowledgeable pot grower will tell you, the female plants produce the most THC, especially when there is no male around to pollinate them. And if enough time elapses and the females are not pollinated, one of them will turn male.
I wonder if they teach that too?