10/22/15 Page 31 Modeling Natural Selection – Rock Pocket Mouse LT: I will be able to describe natural selection and give at least one example of natural selection at work. Evidence : Take notes on the video answer the questions on the sheet. Conclusion: ( use notes, activities, and homework to help you) How can natural selection cause a change in gene frequencies of a population. Make sure to cite numerical evidence from the activity in your claim. Make sure to use the following terms correctly in your explanation: evolution, variation, adaptation, mutation, natural selection, fitness selective pressure. (You may use different forms of these words.) Darwin’s Theory 1. Variation – Individuals differ and some variation is inheritable 2. Overproduction – Organisms produce more offspring than can survive. 3. Competition – organisms compete for natural resources ( resources are limited) 4. Each organism has an advantage or disadvantage in struggle for existence. Best suited to live, reproduce and pass on their genes to offspring. 5. Species alive today have descended with modification from a common ancestor.