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    Simulating Cortical Rotation, Axis Induction, and Experimental Embryology in Amphibian Embryos Using Clay Models
    The study of development requires learners to understand spatially complex concepts like embryo anatomy. Embryo anatomy is dynamic over time, and it is often manipulated by researchers in experiments that are fundamental to the field. This spatial...

    Courses: Developmental BiologyDevelopmental Biology

    developmentXenopusfertilizationEmbryologyinductionSymmetry breakingOrganizerCortical rotationPatterning
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    1649

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    317

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    Differential Gene Expression during Xenopus laevis Development
    In Developmental Biology classes, students are challenged with understanding how differential gene expression guides embryonic development. It can be difficult for students to realize that genes need to be turned on or off at the right time and...

    Courses: Developmental BiologyDevelopmental Biology

    gene expressionXenopusearly developmentembryofertilizationin situ hybridization
    Lesson
    1693

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    494

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    Sex-specific differences in Meiosis: Real-world applications
    In traditional classrooms, students are typically presented with facts that they are asked to memorize and recall during an exam.  The rapid explosion of available scientific facts in recent years has made this model of teaching...

    Courses: Cell BiologyCell Biology GeneticsGenetics Science Process SkillsScience Process Skills

    meiosisReproductionAneuploidyGameteNon-disjunctionOocyteSpermTrisomy
    Lesson
    4868

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    1859

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    Teaching Genetic Linkage and Recombination through Mapping with Molecular Markers
    Most introductory genetics courses cover genetic linkage, a core concept in the CourseSource genetics learning outcome framework. Although it is a classical genetics topic, genetic linkage remains an important concept to understand in order to...

    Courses: GeneticsGenetics Plant BiologyPlant Biology Science Process SkillsScience Process Skills

    meiosisphenotypegel electrophoresismicrosatellitesBanding PatternGenetic linkageInheritanceMolecular MarkersPhysical Linkage
    Lesson
    1804

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    190

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    Inexpensive Cell Migration Inquiry Lab using Zebrafish
    Cell migration is an important and interesting topic that has the potential to engage students in cell biology by its intrinsically active nature. However, most ways to investigate cell migration require expensive equipment not typically available...

    Courses: Cell BiologyCell Biology Science Process SkillsScience Process Skills

    CytoskeletonCell migrationmodel organisms
    Lesson
    9296

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    1205

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    Why Meiosis Matters: The case of the fatherless snake
    A compelling reason to learn something can make all the difference in students’ motivation to learn it.  Motivation, in turn, is one of the key attitudes that drives learning.  This story presents students with a compelling puzzle of a...

    Courses: GeneticsGenetics Science Process SkillsScience Process Skills

    meiosismitosissex determinationAsexual reproductionParthenogenesis
    Lesson
    2642

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    576

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    Linking Genotype to Phenotype: The Effect of a Mutation in Gibberellic Acid Production on Plant Germination
    Basic concepts in genetics and plant development are often taught in lecture courses without a lab component. This approach provides students with the content knowledge, but fails to make connections to research opportunities and real-world...

    Courses: Cell BiologyCell Biology Developmental BiologyDevelopmental Biology GeneticsGenetics Introductory BiologyIntroductory Biology Plant BiologyPlant Biology

    geneticsdevelopmentmutationgerminationplantmodel organismGenotype/PhenotypeHormoneSeed
    Lesson
    5650

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    1168

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    3

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    Meiosis: A Play in Three Acts, Starring DNA Sequence
    Meiosis is well known for being a sticky topic that appears repeatedly in biology curricula. We observe that a typical undergraduate biology major cannot correctly identify haploid and diploid cells or explain how and why chromosomes pair before...

    Courses: Cell BiologyCell Biology GeneticsGenetics Introductory BiologyIntroductory Biology

    recombinationmeiosisDNA sequenceCrossingoverchromosome structureHolliday junctionhomology
    Lesson
    1793

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    342

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    Cutthroat trout in Colorado: A case study connecting evolution and conservation
    Evaluation of evidence is a key process skill for the core competencies of applying the process of science and using quantitative reasoning. This case study enables upper-division biology students to practice these skills by applying evolutionary...

    Courses: EvolutionEvolution GeneticsGenetics Science Process SkillsScience Process Skills

    population geneticsphylogeneticsSpeciationdivergencegene flow