Dr. Stephen O'Brien of the National Cancer Institute discovers a 700-year-old mutation that makes a person resistant to HIV infection. From Evolution: "Evolutionary Arms Race."

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Concepts

genetic mutation, heredity, survival of the fittest, viruses

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Additional Tags

biological adaptation, biological evolution, diversity and adaptations of organisms, evolution of humans, immune system, hiv immunity, hiv resistance, pbs learningmedia: double immunity, teachers' domain, wgbh, hiv, mutations

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Classroom Considerations

Knovation Readability Score: 4 (1 low difficulty, 5 high difficulty)

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