Richard Lenski claims that his experiment provides “one of the most direct demonstrations of Darwinian adaptations by natural selection you can imagine.”
Evolution is good at creating niche advantages by breaking things; it isn’t good at building fundamentally novel forms.
Michigan State University biologist Richard Lenski and collaborators have just published a terrific new paper.
Right now, within your bodies this little engine is cranking away. Without this machine, oxygen-dependent life could not exist.
Lenski agrees that the beneficial mutations seen in his Long Term Evolution Experiment are overwhelmingly degradative or loss-of-function ones.