Overview: Understanding the process of development can help us understand how some major evolutionary changes occurred and why others did not. Author/Source: UC Museum of Paleontology Grade level: 13-16 Time: 20 Concepts: Similarities among existing organisms (including morphological, developmental, and molecular similarities) reflect common ancestry and provide evidence for evolution. Features sometimes acquire new functions through natural selection. New heritable traits can result from mutations. Complex traits can arise through the cooption of another trait. Teacher background: Genetic Variation

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