Evolution picks up hitchhikers

In a twist on «survival of the fittest,» researchers have discovered that evolution is driven not by a single beneficial mutation but rather by a group of mutations, including ones called «genetic hitchhikers» that are simply along for the ride. These hitchhikers are mutations that do not appear to have a role in contributing to an organism’s fitness and therefore its evolution, yet may play an important role down the road.

Fuente : http://www.eurekalert.org/pub_releases/2013-07/pu-…