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  • The Teosinte Hypothesis

    The Teosinte Hypothesis

    Activity

    In this lesson, students work through the mathematics and concepts behind George Beadle’s claim that teosinte is the wild ancestor of maize. Also available in Spanish.

  • Film Guide for Popped Secret: The Mysterious Origin of Corn

    Film Guide for Popped Secret: The Mysterious Origin of Corn

    Film Guide

    The following classroom-ready resources complement the film Popped Secret: The Mysterious Origin of Corn, which tells the story of how geneticists and archaeologists have come together to determine how and where corn was domesticated nearly 9,000 years ago. Also available in Spanish.

  • Exclusion Mapping

    Exclusion Mapping

    Animation

    (32 sec) A useful technique for narrowing down the location of a gene involves comparing the chromosomes of affected siblings. Two sisters with Rett syndrome allow researchers an opportunity to map the most likely location of the gene by excluding areas of the chromosome that are not alike.