Watch the following animation and define in your own words the mechanisms of evolution and give an example of each in your journal. The example could be anything in the natural world. Then explain if the mechanism increases or decreases diversity in the population. You can check your answers when you are done.

1. Define nonrandom mating, give an example of this event. Does this increase or decrease the diversity of a population? Check Your Answer for #1 Individuals seek mates in a subpopulation. Example could be: A duck selects only ducks that have red feathers. Decreases diversity. Close


2. Define migration, give an example of this event. Does this increase or decrease the diversity of a population? Check Your Answer for #2 Individuals of a population leave the original population. Example could be: All ducks with black feathers leave the original populations leaving only ducks with white feathers. Decreases diversity. Close


3. Define genetic drift, give an example of this event. Does this increase or decrease the diversity of a population? Check Your Answer for #3 Chance events reduce the numbers of a certain group of individuals. Example could be: A landslide takes out all of the black-haired mice in the population, leaving only brown-haired mice and white-haired mice. Decreases diversity. Close


4. Define mutation, give an example of this event. Does this increase or decrease the diversity of a population? Check Your Answer for #4 Environment or chance changes the DNA of an individual. Example could be: A mutation in a mouse gives them larger leg muscles which allow them to escape more predators. Increase diversity. Close


5. Define natural selection, give an example of this event. Does this increase or decrease the diversity of a population? Check Your Answer for #5 Certain individuals are chosen over others due to better fit in the environment. Example could be: White moths are eaten more often by birds due to being seen more often on black trees. Decrease diversity. Close