How Darwinism is changing medicine

Some years later, friends at a local natural history museum pointed Nesse towards the theory that ageing is simply a side effect of the evolutionary pressure that has selected certain genes over others. If a condition only manifests after an organism passes its reproductive peak, then there will be no selective pressure to prevent it from being passed on. As a physician, Nesse realised that while he understood how these forces could shape species, he had no clue how natural selection works inside the human body.

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