> Higher organisms do not have a "cost of complexity" - or slowdown in the
> evolution of complex traits - according to a report by researchers at Yale
> and Washington University in Nature.
> Biologists have long puzzled over the relationship between evolution of
> complex traits and the randomness of mutations in genes. Some have
> proposed
> that a "cost of complexity" makes it more difficult to evolve a
> complicated
> trait by random mutations, because effects of beneficial mutations are
> diluted.