What is the minimum eye which confers some evolutionary advantage?
By minimum I mean anything less than this has no advantage whatsoever and therefore is not favored by natural selection.
By eye, I mean not just a light sensor but also infrastructure which converts the light stimulus into an advantageous response.
Ideally would like a clear unambiguous before/after case especially on the infrastructure between the mutated protein and the cell's response mechanism which translates this into a survival advantage.
(I assume Opsin proteins floating around the cytoplasm by themselves confers no advantage without some kind of other infrastructure)
please also provide an estimate of the number of coordinated DNA base pairs which needed to change to confer this advantage so that a proper probability estimate can be done.
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