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  • Somatic Cell Nuclear Transfer Animation

    Somatic Cell Nuclear Transfer Animation

    Animations

    (52 sec) Somatic cell nuclear transfer (SCNT) is a technique for cloning. The nucleus is removed from a healthy egg. This egg becomes the host for a nucleus that is transplanted from another cell, such as a skin cell. The resulting embryo can be used to generate embryonic stem cells with a genetic match to the nucleus donor (therapeutic cloning), or can be implanted into a surrogate mother to create a cloned individual, such as Dolly the sheep (reproductive cloning).

  • HIV life cycle

    HIV life cycle

    Animations

    (4 min 52 sec) How HIV infects a cell and replicates itself using reverse transcriptase and the host's cellular machinery.

  • Planarian Regeneration and Stem Cells

    Planarian Regeneration and Stem Cells

    Scientists at Work

    (11 min 47 sec) A mini-documentary discussing the remarkable regenerative capabilities of the planarian, and how HHMI researcher Alejandro Sánchez Alvarado uses them to study the biology of stem cells.

  • Transgenic Fly Virtual Lab

    Transgenic Fly Virtual Lab

    Virtual Labs

    The lab will familiarize you with the science and techniques used to make transgenic flies to study circadian rhythms.

  • Cardiology Virtual Lab

    Cardiology Virtual Lab

    Virtual Labs

    NEW! HTML 5 support added! This virtual lab will familiarize you with heritable diseases of the heart. Learn about the diagnostic tools used to examine and diagnose patients.

  • Neurophysiology Virtual Lab

    Neurophysiology Virtual Lab

    Virtual Labs

    In this virtual lab, you will record electrical activities of individual neurons, identify by response to stimuli, and use dyes to visualize their morphology.

  • Immunology Virtual Lab

    Immunology Virtual Lab

    Virtual Labs

    This virtual lab teaches the procedures of performing an ELISA test to determine whether a particular antibody is present in a patient's blood sample.

  • Creating Phylogenetic Trees from DNA Sequences

    Creating Phylogenetic Trees from DNA Sequences

    Click & Learn

    This Click and Learn explains how DNA sequences can be used to generate such trees, and how to interpret them. English version is ADA accessible.

  • From Birds to People: The West Nile Virus Story

    From Birds to People: The West Nile Virus Story

    Click & Learn

    West Nile virus infects mosquitoes, birds, and people—with very different consequences.

  • Skeletons Reveal Human and Chimpanzee Evolution

    Skeletons Reveal Human and Chimpanzee Evolution

    Click & Learn

    Comparing features of a 4.4-million-year-old fossil skeleton to those of human and chimpanzee skeletons sheds light on our evolutionary history.

  • Recent Adaptations in Humans

    Recent Adaptations in Humans

    Click & Learn

    Lactose tolerance, sickle cell anemia, and bitter taste perception are three examples of recently evolved human traits.

  • Regulation of the Lactase Gene

    Regulation of the Lactase Gene

    Click & Learn

    Lactase persistence results from a mutation that changes how transcription factors interact, thereby affecting gene expression.

  • Are You a Morning or an Evening Person?

    Are You a Morning or an Evening Person?

    Click & Learn

    This survey, developed by Horne and Ostberg, will let you determine if you are a morning or an evening person.

  • Test Your Knowledge of Sex Determination

    Test Your Knowledge of Sex Determination

    Click & Learn

    Answer the questions in this online quiz to test your knowledge of what determines the sex of a human, a fruit fly, and a snapping turtle.

  • Stopping Mosquito-Borne Disease

    Stopping Mosquito-Borne Disease

    Click & Learn

    Learn about the nature of vector-borne diseases, and the life cycle of the dengue vector mosquito.

  • DNA Sequence Assembly

    DNA Sequence Assembly

    Click & Learn

    Learn the principles of how DNA is sequenced and assembled into whole genomes using the Sanger method, shotgun sequencing, or ultra-deep sequencing.

  • Virochip DNA Microarray

    Virochip DNA Microarray

    Click & Learn

    Answer interactive questions to explore the logic of the Virochip microarray design, particularly how evolutionary relationships can be used to detect new viruses.

  • Sorting Seashells

    Sorting Seashells

    Click & Learn

    Explore principles of taxonomy by sorting seashells according to their morphological characteristics and constructing an evolutionary tree.

  • Symbiotic Bioluminescence

    Symbiotic Bioluminescence

    Click & Learn

    Explore the biology of the symbiotic relationship between the Hawaiian Bobtail squid and bioluminescent bacteria Vibrio fischeri.

  • Bacterial Quorum Sensing

    Bacterial Quorum Sensing

    Click & Learn

    Understand how quorum sensing works by reasoning through experiments involving genetically-engineered bioluminescent bacteria.

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