And what do you think dialectic is phil? It's intellectual evolution - how something changes in response to an alteration in the environment it's in, or in the case of ideas, what is produced when you set one idea against another.
It's the same idea. Change and adapt in response to changing input. Life is rooted in evolution; homo sapiens is a product of it and it's like a fractal - humans create the intellectual environment ideas exist in, and humans alter than environment and ideas change and adapt or die. The basic premise of communism and anarchism - the ideas of respect, cooperation, not being greedy - appear in some form in just about every culture there is, but the way in which it manifests intellectually alters and adapts as society alters and adapts around it. It's a recursive system, change begets change begets change, with each element pushing against the other.
The only difference between ideas and biology is that ideas, as a human creation, can have directional control applied to them which is where doctrines, ideologies and other 'fixed' ideas come from but as we all know, other people have other ideas about these things - look at the diversity of Xtian belief - from dictatorial Roman Catholicism to non-conformists who argue that each 'day' in genesis is in fact a geological epoch.
Evolution is an unbelievably beautiful thing - wasteful, cruel and blind in many ways, but it works.