Certain species of blind fish living in perpetual darkness in the ocean depths have evolved from ancestors that could see. Research indicates that the brain centers for vision in these fish is degenerating, whereas the brain centers controlling other senses are enlarging. What might be the MOST probable reason for the loss of vision in these fish?

Question

Certain species of blind fish living in perpetual darkness in the ocean depths have evolved from ancestors that could see. Research indicates that the brain centers for vision in these fish is degenerating, whereas the brain centers controlling other senses are enlarging. What might be the MOST probable reason for the loss of vision in these fish?

exposure to mutagens that caused the loss of vision

progressive selection of genetic variants in the population leading to blindness as an evolutionary adaptation

infection by cave-dwelling microorganisms that has led to the degeneration of the eyes

extreme high pressure at the ocean depths causing a deterioration of vision

Answer 1

The most probable reason for the loss of vision in these fish is the progressive selection of genetic variants in the population leading to blindness as an evolutionary adaptation.