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Overview: This classroom exercise introduces the concept of evolution by natural selection in a hypothesis-driven, experimental fashion, using a deck of cards. Author/Source: Evolution: Education and Outreach Grade level: 13-16 Time: 1-2 class periods Teaching tips: The standard exercise is suitable for upper-level high school (AP) and introductory biology students at the college level. This exercise can be easily modified to teach advanced evolutionary topics in upper-level courses in evolution and/or ecology and suggestions are given. Concepts: Correspondence to the Next Generation Science Standards is indicated in parentheses after each relevant concept. See our conceptual framework for details. Rates of evolution vary. Artificial selection provides a model for natural selection. Evolution results from natural selection acting upon genetic variation within a population. Natural selection may favor individuals with one extreme value for a trait, shifting the average value of that trait in one direction over the course of many generations. A hallmark of science is exposing ideas to testing. Teacher background: Artificial Selection Natural Selection

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