Assume we have a sentient race that is both non-dimorphic insofar as males and females have no non-cosmetic secondary sexual traits, simply different reproductive organs and perhaps different cosmetic features, and oviparous, i.e. laying already-internally-fertilized eggs. (For instance, this is one possible way to implement reptilian sentients or dragonkin reproduction-wise.)
How would gender roles be divided up by such a people, considering that:
- The egg only stays resident within the mother for a short period of time (hours?) after fertilization (i.e. spend a night in bed, lay the egg in the morning)
- Eggs are fertilized/laid one at a time -- if you want another egg, you have to have another go at it with your spouse
- Neither parent is any better equipped to care for the egg than the other
- Incubation of the egg does not require brooding (the egg can be hidden in a suitable spot and left there)
- Young do need at least some care after hatching, but this also can be provided by either parent
- There is an even chance of getting either gender from any given mating, and it's not influenceable by incubation conditions
Would we see a lean towards one gender or the other handling parenting, or would it be a dead split down the middle? How would the risks for having an even gender split in combat be different? Would we see concepts like patriarchy or matriarchy?