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Rebutting Brad Harrub: Mutations produce nothing new

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Published on Oct 19, 2012

This week, Dr. Brad Harrub demonstrates a shocking lack of understanding of the mechanisms by which evolution explores fitness space. I'll explain how actual biologists mentally think about the processes that lead to changes in fitness.

Evolution doesn't, as most people think, move like an arrow towards higher fitness. It's more like a drunk walk. It gets there in the end, but explores a lot of area looking for landmarks. This "random walk" effect is important to allow for exploration of new fitness peaks, even when getting there involves accepting a decrease in fitness.

This is the last of the pre-produced Harrub videos. It may be a few weeks before I can get around to producing another set.

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