No.. It is a population that evolves, not an individual. Selection of a pre-existing feature that already occurs in the gene pool is exactly how evolution wor

No.. It is a population that evolves, not an individual. Selection of a pre-existing feature that already occurs in the gene pool is exactly how evolution works. There are only two things needed for evolution: 1) generation of diversity between individuals (see sexual recombination, V(D)J recombination, etc) 2) selection of traits The fact that black frogs already existed at some frequency does not mean that the population did not evolve in response to radiation. But you are right that radiation is not the only thing that might select for dark frogs.