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Overview: Students watch a short film and complete a worksheet and graphing exercise that reinforces the concepts of variation and natural selection. Author/Source: Howard Hughes Medical Institute Grade level: 9-12 Time: 50 minutes Teaching tips: Answers to the worksheets are readily available online, so if this is a concern, you may wish to have students complete those in class. Concepts: Correspondence to the Next Generation Science Standards is indicated in parentheses after each relevant concept. See our conceptual framework for details. Evolution results from selection acting upon genetic variation within a population. (LS4.B) Mutations are random. Inherited characteristics affect the likelihood of an organism's survival and reproduction. (LS4.B, LS4.C) Depending on environmental conditions, inherited characteristics may be advantageous, neutral, or detrimental. Natural selection acts on the variation that exists in a population. (LS4.B, LS4.C) Over time, the proportion of individuals with advantageous characteristics may increase (and the proportion with disadvantageous characteristics may decrease) due to their likelihood of surviving and reproducing. (LS4.B, LS4.C) There is variation within a population. (LS3.B) Natural selection is dependent on environmental conditions. Environmental changes may provide opportunities that can influence natural selection. (LS4.B, LS4.C) Teacher background: Genetic Variation Natural Selection

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