Understanding Evolution: Key Concepts

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Natural Selection

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Process where organisms better adapted to environment survive

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Charles Darwin

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Proposed theory of evolution by natural selection

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Survival of the Fittest

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Concept where only the strongest survive and reproduce

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Mutation

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Random change in DNA sequence

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Genetic Drift

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Variation in relative frequency of different genotypes

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Speciation

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Formation of new and distinct species in evolution

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Adaptation

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Trait that helps an organism survive and reproduce

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Fossil Record

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History of life documented by fossils

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Common Ancestor

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Shared ancestor of different species

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Evolutionary Tree

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Diagram showing evolutionary relationships