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This mutation can be classified as a beneficial mutation. The arctic fox's natural habitat is covered in white snow for most of the year, and the white fur provides better camouflage, allowing the foxes to blend in and remain undetected from both their prey and their predators.
With the white fur, the foxes are more likely to be successful hunters as they can stealthily approach their prey without being easily spotted. Additionally, it reduces the chances of being detected by predators like eagles, wolves, and polar bears, which rely on visual cues to locate their prey.
Therefore, the white fur mutation enables the foxes to have an advantage in their environment, improving their chances of survival. It increases their ability to hunt and reduces the likelihood of being preyed upon.