CourseSource: Resources

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Homologous chromosomes? Exploring human sex chromosomes, sex determination and sex reversal using bioinformatics approaches

Constructing a robust understanding of homologous chromosomes, sex chromosomes, and the particulate nature of genes is a notoriously difficult task for undergraduate biology students. In this lesson, students expand their knowledge of human...

Courses: Bioinformatics Genetics Introductory Biology Science Process Skills

bioinformaticsautosomehomologous chromosomeshomologous recombinationsex chromosomesex determinationsex reversal mutations

Science Behind the Lesson

1913

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289

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The Science Behind Parthenogenesis: Interesting things happen when meiosis goes “wrong”

Parthenogenetic reproduction is a fascinating, complex topic. This article accompanies “Why Meiosis Matters: The case of the fatherless snake.” It summarizes the basic information an introductory biology or genetics instructor...

Courses: Cell Biology Genetics Introductory Biology

meiosismitosissex determinationAsexual reproductionParthenogenesis

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9049

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1157

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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: Genetics Science Process Skills

meiosismitosissex determinationAsexual reproductionParthenogenesis

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1626

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472

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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 Biology Genetics Science Process Skills

meiosisReproductionAneuploidyGameteNon-disjunctionOocyteSpermTrisomy

Essay

555

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68

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Teaching about fatherless snakes in a prison classroom

Developing a course for the first time as a graduate student is challenging. When I first taught introductory biology with the Cornell Prison Education Program, I struggled to design and adapt lessons that felt relevant to my students....

Courses: Genetics Introductory Biology

meiosismitosisReproduction

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2328

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230

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Sex and gender: What does it mean to be female or male?

This lesson provides three activities to engage non-science major students in a discussion about sex, gender, gender identity, and sex determination. Students prepare for the lesson by reading a short article titled Sex and gender: What is the...

Courses: Anatomy-Physiology Introductory Biology

gendersex determinationgender identitysex

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323

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43

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0

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The Science and Ethics of Gene Drives: An Active Learning Lesson in Genetics

Coursework connecting biology to socially relevant issues and ethical questions can help students think about biology in interdisciplinary terms. Gene drives represent one topic involving both advanced biology concepts and societally relevant...

Courses: Genetics

bioethicsCRISPR/Cas9Genetic modificationGene drives

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2903

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328

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A Muscular Dystrophy Case Study Illustrating the Phenotypic Effects of Mutation

Mutations in genes can lead to a variety of phenotypes, including various human diseases. Students often understand that a particular mutation in a single gene causes a disease phenotype, but it is more challenging to illustrate complex genetic...

Courses: Developmental Biology Genetics

mutationProtein Structureethicscentral dogmahuman disease

Lesson

3007

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888

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Fruit Fly Genetics in a Day: A Guided Exploration to Help Many Large Sections of Beginning Students Uncover the Secrets of Sex-linked Inheritance

Moving beyond the basic concepts of autosomal Mendelian inheritance to sex-linkage can be difficult for introductory biology students. Although crosses with Drosophila fruit flies have long been a mainstay of genetics units that teach these...

Courses: Genetics

Mendelian Geneticsfruit fly biologysex-linked inheritance

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1821

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454

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Why do Some People Inherit a Predisposition to Cancer? A small group activity on cancer genetics

Before undergraduate students take a genetics course they generally know cancer has a genetic basis and involves the proliferation of cells; however, many are uncertain about why only a subset of people have a predisposition to cancer and how that...

Courses: Genetics Science Process Skills

cancerInheritance patternsProbability calculationProto-oncogeneTumor Suppressor Gene

Lesson

3635

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250

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Fragile States: A Case Study Exploring Genetics, Molecular Biology, and Biochemistry Through the Lens of Fragile X Syndrome

This case aims to strengthen students’ understanding of molecular biology concepts through study of Fragile X Syndrome (FXS). Students begin by learning the cause and phenotypes of FXS and related conditions. Students then apply genetics...

Courses: Biochemistry and Molecular Biology Genetics

gene regulationtranscriptiontranslationFragile X syndrometriplet repeat expansionsex linkagemetabolic pathway

Lesson

6068

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522

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Meiosis Remodeled: Inclusion of New Parts to Poppit Bead Models Enhances Understanding of Meiosis

A long-standing tradition uses strings of poppit beads of different colors to model meiosis, especially to show how segments of paired homologous chromosomes are recombined. Our use of orthodontic latex bands to model cohesion of sister...

Courses: Cell Biology Genetics Introductory Biology

meiosischiasma formationchromosome recombination

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5501

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1133

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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 Biology Genetics Introductory Biology

recombinationmeiosisDNA sequenceCrossingoverchromosome structureHolliday junctionhomology

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1172

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352

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The ACTN3 Polymorphism: Applications in Genetics and Physiology Teaching Laboratories

Inquiry-based undergraduate laboratories provide the opportunity to engage students in a research experience that improves scientific thinking, but such activities can be difficult to develop and implement due to limited time and resources. We...

Courses: Anatomy-Physiology Genetics

protein structure and functionhuman genetic variationmuscle physiology

Lesson

885

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123

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Student-Generated Analogies for Learning about Information Flow

Using analogies is a standard practice for both teaching and communicating ideas in science. Here we upend the traditional lesson, where the instructor provides a fully constructed analogy and explains it, by having the students develop a complex...

Courses: Biochemistry and Molecular Biology Cell Biology Genetics Introductory Biology

critical thinkingcentral dogmaanalogical reasoning

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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: Genetics Plant Biology Science Process Skills

meiosisphenotypegel electrophoresismicrosatellitesBanding PatternGenetic linkageInheritanceMolecular MarkersPhysical Linkage

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877

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Population Ecology of the Northern Spotted Owl

The mathematical modeling of populations utilizing field-collected demographic data is an important component of lab curricula in a variety of undergraduate biology lab courses. During the global pandemic brought about by the SARS-CoV-2 virus in...

Courses: Ecology Ecology Introductory Biology

demographyCommunity Ecologypopulation ecologyconservation biologylife tables

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A Modeling Exercise in Sexual Selection using a Student-Created Bird Species

Evolution-centered lessons at the undergraduate level can often be jargon-heavy, propagate misconceptions if taught ineffectively, and be uninteresting to students who may not see the relevancy of such concepts. This activity provides a fun and...

Courses: Ecology Ecology Evolution Introductory Biology

Evolutionfitnesssexual selectionNatural Selectionintersexual selectionmate choice

Science Behind the Lesson

389

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29

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X-ploring Fragile X: The Science Behind the Syndrome

Fragile X Syndrome is an X-linked genetic disorder resulting from the impairment of transcription of the FMR1 gene, producing less to no FMRP protein. FMRP is a translational inhibitor that plays a key role in neurological development. Recent...

Courses: Biochemistry and Molecular Biology Genetics Introductory Biology

epigeneticsgene regulationtranscriptioncentral dogmatranslationFragile X syndromeSphingosine Metabolism

Teaching Tools and Strategies

1258

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Using Constructed Response Questions on High-Stakes Assessments in Large Classes With Limited Support

Large lecture courses often rely heavily, and sometimes exclusively, on Multiple Choice (MC) exams to assess student learning. Constructed Response (CR) questions, in which students generate their own answers, can provide more insight into student...

Courses: Genetics