401: Widespread Parallel Evolution in Sticklebacks by Repeated Fixation of Ectodysplasin Alleles -- Colosimo et al. 307 (5717): 1928 -- Science

Widespread Parallel Evolution in Sticklebacks by Repeated Fixation of Ectodysplasin Alleles -- Colosimo et al. 307 (5717): 1928 -- Science:

Genetic evidence shows that sticklebacks repeatedly lost their armor as they entered freshwater. Evolutionary hypothesis tested.

This is very cool work and a neat system. We knew that the species had repeatedly invaded freshwater habitats, and we know that they repeatedly evolved similar body forms. What they did here was show what genetic changes were associated with some of that parallel evolution. These are natural evolutionary experiment. Evolution is repeatable.