Relate Variation to Selection Pressure Practice Test

A mouse population includes light-colored and dark-colored individuals. The mice live on pale sand dunes, and hawks hunt them by sight during the day. Which trait is most likely to increase in frequency over generations due to this environmental pressure?

A rabbit population includes individuals that run fast and individuals that run more slowly (a heritable difference). In one area, foxes frequently hunt rabbits. In a nearby fenced area, foxes are absent. Which outcome best matches how natural selection depends on the environment?