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NAME _____________________________ BLOCK ______ Biology - CHAPTER 16.1 -16.2 BACKGROUND SUMMARY Read pages 393-402 in your textbook and answer the following questions in complete sentences Chapter 16.1 1. Explain what the term relative frequency means. Include an example in your answer. 2. Define evolution in genetic terms? 3. Name and describe the two processes that can lead to inherited variation in populations? 4. How does the range of phenotypes differ between single-gene traits and polygenic traits? 5. What is a gene pool? How are allele frequencies related to gene pools? Chapter 16.2 6. Describe how natural selection can affect traits controlled by single genes? 7. Identify the graphs below. For each one, describe how natural selection modified the normal bell shape curve, and give an example? 8. What is genetic drift? 9. How does genetic drift lead to a change in a population’s gene pool? 10. What is the founder effect? 11. What is the Hardy-Weinberg principle? 12. What are the five conditions required to maintain genetic equilibrium?