All or Nothing FeaturesThis web page is mainly about factors that accelerate evolution and explores the idea that by acting on the mechanism of change the power of evolution is enhanced.
However, accelerating evolution is not enough to solve some chicken-and-egg type problems. The speed ups only work if there is already some small advantage in a change in a particular direction, they help to lock in on that direction.
There are a number of cases where it is hard to see how a partly evolved version of some feature would be at an advantage. Without this, how can evolution act?
Three apparently all-or-nothing problems to the theory of evolution are: