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  • Selective Breeding in Maize

    Selective Breeding in Maize

    Data Point

    Researchers performed the longest-running, controlled artificial selection experiment to study whether they could increase the protein concentration of maize (corn) by selective breeding.

  • The Teosinte Hypothesis

    The Teosinte Hypothesis


    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.

  • Popped Secret Film with Quiz

    Popped Secret Film with Quiz

    Interactive Video

    (17 min 51 sec) Embedded quiz modules test students’ understanding as they watch a short film on the evolutionary origins of corn.

  • 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.

  • Popping a Kernel

    Popping a Kernel

    Image of the Week

    When heated to a temperature of around 180°C, corn bursts open with a “pop” in mere hundredths of seconds.

  • Popped Secret: The Mysterious Origin of Corn

    Popped Secret: The Mysterious Origin of Corn

    Short Film

    (17 min 51 sec) Where did corn come from? Genetic and archeological data point to what may seem like an unlikely ancestor: a wild Mexican grass called teosinte. Also available in Spanish.

  • Mapping Genes to Traits in Dogs Using SNPs

    Mapping Genes to Traits in Dogs Using SNPs


    In this hands-on genetic mapping activity students identify single nucleotide polymorphisms (SNPs) correlated with different traits in dogs.

  • Dog Genomics and Dogs as Model Organisms

    Dog Genomics and Dogs as Model Organisms


    (28 min 54 sec) Dr. Elinor Karlsson discusses her work with dogs as a model organism for genomic studies.

  • Teacher Guide: Evolution

    Teacher Guide: Evolution

    Teacher Guide

    Topics include: natural selection, artificial selection, population genetics, human adaptations and evolution, and phylogenetics.

  • Natural and Artificial Selection

    Natural and Artificial Selection

    Click & Learn

    Learn about artificial and natural selection.

  • Selection in Action

    Selection in Action


    (58 min 29 sec) Comparing the artificial selection of dogs and corn with the natural selection of the stickleback fish.

  • Dog Breeding

    Dog Breeding


    (1 min 53 sec) The many forms of dogs that exist today were all created through selective breeding from the dog's ancestor, the wolf. In a span of less than 10,000 years, breeders have changed traits and body shapes of dogs by artificial selection-for example, emphasizing different aspects of hunting and herding behavior.

  • Breeding Corn from Teosinte

    Breeding Corn from Teosinte


    (52 sec) Corn was originally bred from the teosinte plant by native Mexican farmers. The morphologies of modern-day corn and teosinte plants are compared to illustrate how artificial selection can bring about dramatic changes in plants.

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