1.You are studying a population of western field mice with light colored coats. Across a nearby stream is a population of the same species with dark colored coats. During a drought the stream dries up. Soon after that you start to notice baby mice in your study population with dark colored coats.
3. You are studying primates in West Africa and discover a small population of monkeys in an isolated forest patch. They resemble a familiar species that lives about 50 kilometers away, across a wide river. The main difference appears to be that almost all of the monkeys in the small isolated population have white ear tufts while few members of the familiar species have this trait.
4. You begin a study of a population of ocelots on a large island in Panama.These ocelots have been studied continuously for 40 years by various researchers. During your study, a female gives birth to a cub with no spots. There has never been an ocelot with this coat pattern recorded in this or any other population of ocelots.