If a mutation allows the possessor of the mutated gene to gain an advantage over his peers in the gene pool then those (mutated) genes will become more prevalent through greater reproductive success. But the environment has not directly caused the gene to change
If a mutation allows the possessor of the mutated gene to gain an advantage over his peers in the gene pool then those (mutated) genes will become more prevalent through greater reproductive success. But the environment has not directly caused the gene to change