Originally posted by TheLurch
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I.e. the path is selectable, myoglobin => hemoglobin.
Well, please point out the steps i mentioned that don't appear to be selectable then. Saying "i question it" without telling us what you question isn't useful.
It's the same thing with the blue structure. It's a ring, and all members of the ring are descendants of a single ancestral protein. It only took one protein-protein interaction to make the ring, then another to get it to link to the red structure, and then a series of duplication/diversification events to create lots of individual, specialized genes instead of a single, generalist version.
What about all that stuff on top? That's all built out of individual protein-protein interactions. Once the scaffolding was in place, interactions among them could be selected for, and have in a couple of places.
Blessings,
Lee
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