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Concept Sheet Evolution of Populations (16) TEKS: 2B, 2C, 3A, 3C, 3F, 6C, 6D, 7B, 12D Objectives: Students will 1. Explain what a gene pool is. 2. Identify the main sources of inheritable variation in a population. 3. State what determines how a phenotype is expressed. 4. Explain how natural selection affects single-gene and polygenic traits 5. Describe genetic drift. 6. List the five conditions needed to maintain genetic equilibrium. 7. Identify the condition necessary for a new species to evolve. 8. Describe the process of speciation in the Galapagos finches. Resources: PH pp. 392-415; HMH pp. 316 - 342 Vocabulary Gene pool Relative frequency Single-gene trait Polygenic trait Sources of Genetic Variation Mutation Gene shuffling Directional selection Stabilizing selection Disruptive selection Genetic drift Founder effect Hardy-Weinberg principle Genetic equilibrium Speciation Reproductive isolation Behavioral isolation Geographic isolation Temporal isolation Test Date: ______________________