>>83211184Yes, not exactly DNA, but a chemical information storage system, like metabolism, is necessary for life to exist.
To add to what the other guy was saying, the reason you end up with binary genders is that, in general, producing young is energy inefficient. It costs a lot to do, does not benefit the parent, but is necessary. So you end up with half the members of the species who have to devote a large part of their metabolism inefficiently, while the other half gets to take all that energy and use it as best they can (more muscles, thicker bones, whatever). A third, in between gender does in fact happen in some species. They are the lizards Human made those comics about, but notice it is a mating strategy. One large lizard that controls territory and has many mates, one smaller lizard that pretends to be female to mate with a smaller number in the large males territory, and the female, who produces young. If a species has multiple genders, it's likely to be a mating strategy, which means you would have 2, 3, whatever types of males and 1 female. Because producing young, as I said above, highly energy inefficient.
