Why do we have two genders?
Why is it that we need a man and a woman in order to naturally reproduce? Why not asexual or 3 different genders?
I've thought about how interesting evolution turned out to be. If we reproduced asexually, then aren't we effectively just creating a clone of ourselves? But when we reproduce like we do now, we give the offspring 2 different genes with dominant/recessive traits.
So maybe it was because we needed a female and male to survive a harsh environment of some sort, or otherwise we wouldn't need to and we'd just reproduce asexually. So if we required 3 genders to reproduce, maybe this would be needed to survive an even harsher environment? Or do we just need two genders to create intelligent life...
Would this also warrant the same outcome if there was a planet almost identical to earth? Like would intelligent life on that planet also take the form of similar skeleton structure, similar muscle structure, similar brain and organs?
If anyone's also got books or references on this, I'd be glad to check them out :)