`:::Wow.  That's a bit intimidating. ;)  And I'm not really qualified to mess with it.  Even so, you say ``generative fixation`` over and over again without saying very clearly what that means, and still emphasize the different hypotheses and the ``breaking`` between them.  I would think to trim this down a bit:  ::::``An alternate explanation dismisses the importance of building blocks and hierarchies thereof and proposing that a small group of unlinked genes can be a Unit of selection.  [*]  Hypothesizing that a heuristic called ``generative fixation`` is implemented with great efficiency, it returns to classic positions in population genetics: 1) That fixation is the vehicle by which adaptive gains are secured. 2) That the function of recombination is to prevent hitchhiking.``  :::I'm not sure that's a good edit (I actually don't understand how a group of unlinked genes works as a unit of selection), nor that it is edited enough, but I hope it's a step in the right direction.     `