entry

Proceedings of the National Academy of Sciences
There's a speed limit to the pace of evolution, Penn biologists say
A major conclusion of the work is that for some organisms, possibly including humans, continued evolution will not translate into ever-increasing fitness. Moreover, a population may accrue mutations at a constant rate –- a pattern long considered the hallmark of "neutral" or non-Darwinian evolution -– even when the mutations experience Darwinian selection. ...
Eurek Alert
Full Story