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  • Sexual Evolution: From X to Y

    Sexual Evolution: From X to Y

    Lecture

    (1 hr 28 sec) Dr. Page explains how successive inversions and deletions of the Y chromosome during mammalian evolution have reduced it to its present form—small and sparsely populated with genes.

  • Emerging Infections: How Epidemics Arise

    Emerging Infections: How Epidemics Arise

    Lecture

    (59 min) Dr. Ganem analyses the complex causes of epidemics—how changes in the environment and in human social behavior can give rise to new infectious diseases.