I don’t see why genetic drift would increase this particular mutation. On average I expect genetic drift to destroy the body’s ability to produce substances and not increase their production of them.
If the selection pressure is due to certain risk-taking behavior, it’s not clear that we see a removal of selection pressure. In humans, we certainly don’t have an environment which is similar to those cavefish as far as the selection pressures go.
I don’t see why genetic drift would increase this particular mutation. On average I expect genetic drift to destroy the body’s ability to produce substances and not increase their production of them.
If the selection pressure is due to certain risk-taking behavior, it’s not clear that we see a removal of selection pressure. In humans, we certainly don’t have an environment which is similar to those cavefish as far as the selection pressures go.