Dr. Nachman examined dark-colored mice from two different populations living hundreds of miles apart. The mice looked nearly identical. Their dark color was caused by two different genes. What does this tell you? (Note: More than one answer is correct.) Dark-colored fur evolved only once in rock pocket mice. There are at least two genes creating dark-colored mouse fur. Dark fur color evolved independently on each lava flow. Different mutations in two different genes cannot generate the same phenotype. Under similar conditions, natural selection can favor similar adaptations.