It's evolution, not adaptation
by
JGC
07/22/2008, 10:15 AM #
“anyone knows that if you lift weights as a young person you gain muscle mass and if you stop lifting you lose it.”
>>That’s adaptive change, not evolutionary change. It occurs at the level of the individual, not as a result of a change in genetic composition, and as such isn’t inheritable.
The salamander’s loss of vision, on the other hand, represents evolutionary change: it occurred at the level of the population, not the individual, as the result of an inheritable change in genetic composition.