Given any kind of living organism what logical reasons could result in a species having more than three genders?
Given any kind of living organism (plant, animal, silicate, gaseous, energy, etc.,) what logical reasons (natural, environmental, evolutionary selection, nurtured, artificial) could result in more than three genders?
There are a number of possible methods for single-gendered reproduction. See examples here....
Bi-gendered species are commonly known, won't get into that.
Possible tri-gendered combinations could be womb/sperm-donor/egg-donor, or perhaps womb&egg-donor/sperm-donor/post-birth-nurturer.
One possible quad-gendered combination could be womb/sperm-donor/egg-donor/post-birth-nurturer.
These combinations are, of course, simply swapping around the known existing gender parts from humans. I have not attempted to combine any of these with the asexual reproduction methods listed in the link, which could result in possible additional groupings and multiple genders (or perhaps heterogamy over time instead). What other possible combinations could exist, and what logical reasons could cause a species to have/develop more than three genders?
I have read this link, and it did not answer my particular angle.
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