It seems to me that there wouldn’t be any selection pressure for identical twins to compete for resources (if someone has the same genome as you, you don’t acquire any fitness advantage from competing with them), but I suppose there may be competitive instincts that are selected for in the case of fraternal twins for which there is no shutoff switch in the case of identical twins.
It seems to me that there wouldn’t be any selection pressure for identical twins to compete for resources (if someone has the same genome as you, you don’t acquire any fitness advantage from competing with them), but I suppose there may be competitive instincts that are selected for in the case of fraternal twins for which there is no shutoff switch in the case of identical twins.