Focus Question: How does natural selection lead to adaptation in populations? The characteristics of an organism that help it to survive in a given environment. This variation may already exist within the population, but often the variation comes from a mutation, or a random change in an organism's gene.
The Urban is the mouse environment in this case. This adaption increases the organism fitness by their skin tones and the amount of predators in the environment, in this case the predators isn't really a problem among the city mouses.
The genetic variations within this population is skin tone such as light colors and dark colors. The environment depend on the type of skin tones and that depends how the are going to survive in the urban.
We found that genome wide variation is inversely related to urbanization as measured by percent impervious surface cover, and to a lesser extent, human population density. We also report that urbanization results in enhanced genome wide differentiation between populations in cities.
The survival of this type of mouse is mostly all of them die because in the urban their isn't really predators to kill them. It fits prefect in the environment because it stays the same and reproduce more
Some changes that might happened is that the genes among them would become stronger such as the skin tone,size or immune system.