Animal research ethics debate
Do now
Students will debate the ethics of using model organisms like C. elegans in human-health research.
- Hand in
- Written personal stance on using C. elegans in research, citing one justification and acknowledging one genuine ethical concern.
- Where
- Turn this in at the drop folder with your district Microsoft sign-in, or hand it to Mr. Mendoza in class. Both count as submitted. Doing the activity in myPLTW does not.
You get two school days for every day you were absent, so this deadline moves with you.
Should a lab be allowed to use thousands of C. elegans worms to study a disease pathway that also exists in humans?
Students will debate the ethics of using model organisms like C. elegans in human-health research.
- • Each student articulates a stance backed by a reason.
- • Groups surface at least one real ethical tradeoff.
- Name one reason a scientist might study a worm instead of going straight to human patients.
- Name one thing that could make you uncomfortable about using living animals in research.
- 1Read a short prompt on why scientists use model organisms.
- 2Form groups representing researchers, ethicists, and patient advocates.
- 3List two justifications and two concerns about animal models.
- 4Exchange one rebuttal with an opposing group.
- 5Write your personal stance with one supporting reason.
What did this day actually feel like?
Animal research ethics debate
ETHICS DAY Using C. elegans, a roundworm about a millimetre long, in research. Does a simpler nervous system change the ethics, and where exactly is the line?
I said the line is capacity to suffer, and then had to admit I do not know where that sits for a worm and neither does anyone else with certainty. Writing a personal stance with one justification was harder than the usual CER because it is mine rather than a position I picked to argue.
Turned in: exit ticket → Exit Tickets folder
Fiction. There is no such student. The lessons, labs and dates are the real planned course; the student, the classmates and the conversations are invented.
The same day, drawn.
Using C. elegans, a roundworm about a millimetre long, in research. Does a simpler nervous system change the ethics, and where exactly is the line?
Fiction. There is no such student. The lessons, labs and dates are the real planned course; the student, the classmates and the conversations are invented.
🛠 Get unstuck · pick your level
🔑 Today's words · 5
Tap a word in the lesson for a plain meaning and one example. Recycled into next week's Do-Now.
Do the work · 80-minute blockfirst 5 min = hook▸
💡 Big idea: Scientists use model organisms because they share conserved biology with humans, so their use always carries an ethical cost that must be weighed against the knowledge gained.
- 0-8Read the model-organism prompt; assign stakeholder roles to groups
- 8-22Group prep: list 2 justifications and 2 concerns from your stakeholder view
- 22-40Debate round 1: each group states its strongest justification
- 40-55Rebuttal round: each group responds to one opposing claim
- 55-70Individual writing: personal stance with one supporting reason
- 70-80Pair-share stances and submit exit ticket
- • A tiny transparent worm has helped scientists win multiple Nobel Prizes in medicine.
- • Today you will decide whether using that worm, and others like it, is ethically justified.
- • Bioethics debate sharpens your ability to evaluate evidence and communicate reasoning clearly.
- • You will leave with a written, reasoned stance you can defend.
- • Model organisms like C. elegans are used because they share conserved biological pathways with humans.
- • Research ethics weighs scientific benefit against potential harm to living subjects.
- • Understanding why we use model organisms connects to Microbiology and Evaluate Body Systems WebXam domains.
Unit 2.2 Research Model: Model organisms, C. elegans, neurotransmitters/hormones, scientific literature, research poster. · Animal research ethics debate
Day 1 of this lesson. Open this exact section in myPLTW (find it in Clever, Microsoft sign-in), then do the work below.
Do this: Open Lesson 2.2 Everything Endocrine or Lesson 2.3 Challenge Accepted in myPLTW and complete any activity or reflection prompt assigned for today's model-organism ethics debate.
Mark the activity complete in myPLTW after submitting your exit ticket on C. elegans research ethics.
You finished the endocrine week; today begins the research-design phase bridging Lessons 2.2 and 2.3, and the task should be checked off.
Note or screenshot of completion status for your tracker.
The official PLTW activity stays inside myPLTW. If myPLTW will not open, use F1 and E1-E3 on this page to complete today's local evidence decision, then make up the official activity when access returns. Turn this in at the drop folder with your district Microsoft sign-in, or hand it to Mr. Mendoza in class. Both count as submitted. Doing the activity in myPLTW does not.
Check things off as you work, then submit. This tells Mr. Mendoza how you're doing so he can help the class. It does not replace turning in your producible through the submission route shown below.
Use the code Mr. Mendoza gave you, not your name. Saved on this device.
Unit 2.2 Research Model: Model organisms, C. elegans, neurotransmitters/hormones, scientific literature, research poster. · Animal research ethics debate
Open Lesson 2.2 Everything Endocrine or Lesson 2.3 Challenge Accepted in myPLTW and complete any activity or reflection prompt assigned for today's model-organism ethics debate.
You finished the endocrine week; today begins the research-design phase bridging Lessons 2.2 and 2.3, and the task should be checked off.
This is how Mr. Mendoza sees the class keeping pace with PLTW. Be honest, it only helps if it is accurate.
🎯 Students will debate the ethics of using model organisms like C. elegans in human-health research.
- Read a short prompt on why scientists use model organisms.
- Form groups representing researchers, ethicists, and patient advocates.
- List two justifications and two concerns about animal models.
- Exchange one rebuttal with an opposing group.
- Write your personal stance with one supporting reason.
Exit ticket: Written personal stance on using C. elegans in research, citing one justification and acknowledging one genuine ethical concern.
Turn this in at the drop folder with your district Microsoft sign-in, or hand it to Mr. Mendoza in class. Both count as submitted. Doing the activity in myPLTW does not. Use the checklist just below and upload by 11:29 PM for full credit. Absent with an excused absence? You get two school days for every day you were absent, so this deadline moves with you.
| Task | Who |
|---|---|
| Read a short prompt on why scientists use model organisms. | _______ |
| Form groups representing researchers, ethicists, and patient advocates. | _______ |
| List two justifications and two concerns about animal models. | _______ |
| Exchange one rebuttal with an opposing group. | _______ |
| Write your personal stance with one supporting reason. | _______ |
Working solo? Put your own name in "Who" for every row.
- Each student articulates a stance backed by a reason.
- Groups surface at least one real ethical tradeoff.
- 1Do thisStudents will debate the ethics of using model organisms like C. elegans in human-health research.
- 2Use this resource
- 3Submit thisExit ticket: Written personal stance on using C. elegans in research, citing one justification and acknowledging one genuine ethical concern.
- 4Submit it here
- 1Open the drop folder.
- 2Sign in with your district Microsoft account, not a personal one.
- 3Upload the file, named Lastname_Firstname__Assignment Title.
- 4Your own upload panel says Uploaded with a green check: that is your receipt.
Turn this in at the drop folder with your district Microsoft sign-in, or hand it to Mr. Mendoza in class. Both count as submitted. Doing the activity in myPLTW does not. Human Anatomy & Physiology (Human Body Systems) › Unit 2.2 Research Model: Model organisms, C. elegans, neurotransmitters/hormones, scientific literature, research poster. › Exit ticketOpen the drop folder
Learn it · deck, reading, and vocabulary▸
The deck carries the prior idea forward, lets you inspect an analogy, maps the rule to biology, and ends with the same evidence decision and exit ticket used on this page.
Generated from this lesson's canonical data with a red-team citation check.
A glucose graph reveals whether is intact because specific values over time show the correcting the deviation, so that a curve that never returns to baseline points to exactly where the loop failed.
Scientists use model organisms because they share conserved biology with humans, so their use always carries an ethical cost that must be weighed against the knowledge gained.
A bridge prototype is tested against a load limit, cost limit, and user need before revision.
- Which requirement is a criterion?
- Which limit is a constraint?
- What test result should trigger a redesign?
A design improves when evidence is compared with explicit criteria and constraints.
Biomedical designs also require , ethics, and biological validation beyond a physical prototype test.
- • Bridge requirements map to design criteria.
- • Load results map to E1-E3.
- • Revision maps to the next evidence-based iteration.
Driving question: Should a lab be allowed to use thousands of C. elegans worms to study a disease pathway that also exists in humans?
What you already know: A glucose graph reveals whether is intact because specific values over time show the correcting the deviation, so that a curve that never returns to baseline points to exactly where the loop failed.
New idea: Scientists use model organisms because they share conserved biology with humans, so their use always carries an ethical cost that must be weighed against the knowledge gained.
Visual or model: F1. F1. A lesson illustration or teaching diagram for Animal research ethics debate. Use it with E1-E3; it is a model or context image, not experimental or patient data. What to notice: Trace the labeled structure, movement, or system relationship that connects form to function.
- Observe or measure the relevant feature in Animal research ethics debate.
- Organize the observation with a stable evidence ID.
- Apply this rule: A design improves when evidence is compared with explicit criteria and constraints.
- Choose the option the evidence supports and state the limit of the conclusion.
Real biomedical example: Should a lab be allowed to use thousands of C. elegans worms to study a disease pathway that also exists in humans?
What the evidence supports: E1-E3 and F1 support the daily take-home when the response meets the stated success criteria.
What it cannot prove: The package does not support claims beyond this lesson's or any real patient diagnosis.
- • : A species, such as zebrafish or mouse, studied because its biology is similar enough to ours to teach us about human development and disease.
- • C. elegans: Use the lesson context and glossary entry to explain C. elegans in your own words.
- • : A that measures the presence, amount, or activity of a target substance such as a , , or chemical in a sample.
- • literature: The body of published research articles and reports on a topic that scientists read to learn what is already known before doing new work.
- • variable: Any factor in an experiment that can change or be changed, including what you test, what you measure, and what you hold steady.
- • control: The comparison condition that isolates the effect of the variable being tested by keeping everything else the same.
- • : The number of subjects or observations in a study; larger samples give more reliable results and reduce the role of chance.
Use it now: Choose one decision option. Cite E1 and E3, then explain how the rule connects the evidence to your choice.
Go further, optional: The source links below are optional enrichment. Every fact required for today's local evidence decision appears in this lesson package.
Model organisms like C. elegans are used because they share conserved biological pathways with humans.
Limit: E1 supplies context or an observation; it does not by itself establish the explanation.
Scientists use model organisms because they share conserved biology with humans, so their use always carries an ethical cost that must be weighed against the knowledge gained.
Limit: E2 is a teaching statement or comparison and must be checked against the task evidence.
Each student articulates a stance backed by a reason.
Limit: E3 supports only the result or product criterion named here; it cannot justify a broader clinical or causal claim.
PLTW-HAP-2027-04-06 · Simulated classroom evidence scenario
Your role: anatomy and physiology consultant
Decision: Your team must decide what the evidence from Animal research ethics debate supports before submitting the exit response named on the lesson page.
- • Keep the current design.
- • Revise the feature that misses a criterion.
- • Run one more fair test before choosing.
Response: State one choice, cite at least two evidence IDs, explain the rule that connects them, and add one limitation. Submit it as the exit response.
Claim ceiling: The supplied lesson evidence can support an observation, pattern, classroom mechanism, or next-step decision about Animal research ethics debate. It cannot by itself prove causation, establish a real clinical diagnosis, or justify action outside this classroom task.
Reason for review: Your team must decide what the evidence from Animal research ethics debate supports before submitting the exit response named on the lesson page.
Context: Biomedical progress rests on model organisms, so scientists must weigh the good the research can do against the cost to the living things used to get it.
- • T1: Read a short prompt on why scientists use model organisms.
- • T2: Form groups representing researchers, ethicists, and patient advocates.
- • T3: List two justifications and two concerns about animal models.
- • T4: Exchange one rebuttal with an opposing group.
- • T5: Write your personal stance with one supporting reason.
- • E1: Model organisms like C. elegans are used because they share conserved biological pathways with humans.
- • E2: Scientists use model organisms because they share conserved biology with humans, so their use always carries an ethical cost that must be weighed against the knowledge gained.
- • E3: Each student articulates a stance backed by a reason.
Measurements: No patient measurement is supplied unless it appears explicitly in E1-E3 or F1. Do not invent a value.
Figure finding: Teaching diagram for Animal research ethics debate. Trace the labeled structure, movement, or system relationship that connects form to function. This is a teaching model, not patient or experimental data.
Uncertainty: This is a composite classroom scenario. Missing history, measurements, or confirmation tests remain unknown and limit the conclusion.
- • The solution must address the stated need in Animal research ethics debate.
- • The decision must be supported by E1-E3.
- • The final product must make the success criteria visible.
- • Complete the work inside the 80-minute block.
- • Use only supplied or teacher-approved materials and evidence.
- • Do not trade , accessibility, or privacy for speed.
- • and evidence quality: must pass before scoring other criteria.
- • User need and effectiveness: highest scored criterion.
- • Time, cost, and ease of use: compare only after and effectiveness pass.
Test evidence: For each option, record the E1-E3 result that supports or fails each criterion. Do not assign a score without a named observation.
- Version or option tested
- Criterion met or missed
- Evidence ID and result
- Revision made
- Reason for the revision
- Need and user
- Criteria and constraints
- Chosen option and evidence
- Test result
- Revision and reason
Students often think Students often think research ethics means "animal testing is always wrong" or "science can do whatever it wants.". The trap: Both extremes skip the actual work. Ethics is not a yes-or-no switch; it is a weighing of benefit against harm, which is exactly why review boards exist and why the same study can be approved for worms but not for dogs.
Parallel scenario (not today's prompt): A lab wants to use zebrafish embryos to screen a new heart drug for toxicity before any human volunteers take it. Should that be allowed?\n\nClaim: I support the careful use of zebrafish embryos to screen a new drug for toxicity before human testing begins.\n\nEvidence (one justification): Zebrafish embryos are transparent and develop outside the mother, so scientists can watch the heart and other organs form in real time and see harmful effects early. Zebrafish also share many of the same organ systems and genes as humans, and running an early toxicity check in embryos flags dangerous compounds before they ever reach a human volunteer or a larger, more complex research animal.\n\nReasoning: Because zebrafish biology overlaps with human biology, a toxic effect seen in the embryo is a meaningful warning sign, and catching it early protects both future patients and other animals from unnecessary harm. That link between the model and the human question is what makes the test worth doing.\n\nGenuine ethical concern I acknowledge: Zebrafish embryos are still developing living organisms, and a result in a fish does not always predict what happens in a person, so a drug could look safe in the embryo and still harm humans, or look harmful and be dropped for the wrong reason. Because of that, I think embryo screening should follow clear welfare limits, use only as many embryos as the question requires, and be reported honestly about what the model can and cannot show.
This model shows the level of evidence and organization needed to complete: A written personal stance on using zebrafish embryos to screen a new drug for toxicity that cites one justification and acknowledges one genuine ethical concern.
- Name the prompt or task.
- Answer it directly with the key evidence.
- Check that the response matches the requested format.
Keep the structure. Replace the question, facts, measurements, and evidence. Then recheck units, vocabulary, and whether the conclusion goes beyond the evidence.
Also due today: Submit your exit-ticket on the class site, or hand it to Mr. Mendoza in class.
- CER:
- Claim, Evidence, Reasoning: make a claim, back it with evidence, explain your reasoning.
- SOP:
- Standard Operating Procedure, the exact steps to follow (especially in a lab).
- Tracker:
- Your PLTW progress log where you record completed evidence.
- myPLTW:
- The PLTW course site where you do the online activities. Find it in Clever with your Microsoft sign-in, right next to Schoology.
Tap the speaker to hear a term. Add two of these to your notebook glossary with a definition and an example in your own words.
Pick just 2 or 3 words from today and make them yours: write what each one means in your own words, name the context clue or evidence that helped, then give one example from what you actually did in Animal research ethics debate. Try your own words first; the glossary is there if you get stuck. This is voluntary and counts as extra credit, so keep it short.
Saved on this device. Show Mr. Mendoza or add these to your notebook glossary to claim the extra credit.
Hand-picked readings, videos, and interactives for this lesson, all free and from authoritative open organizations (NIH, CDC, OpenStax, Khan Academy, PhET, HHMI, and more).
A fillable, Cornell-style notebook for Unit 2: Research Ready. Type your notes, cues, and summaries right in the PDF, or print it and write by hand. Each lesson page has a cue column, a notes column, and a summary box, plus dated lab-record pages you can turn in.
HBS Unit 2 notebook: Research Ready Fillable PDFCornell notes + lab recordsOpenVetted readings and references for this unit. Use them to prepare, to catch up if you were absent, or to go deeper on today's target.
This site may ask you to verify you are human. If it blocks you on a school device, ask for the class copy.
Check yourself · commit, then reveal▸
Claim ceiling for this check: The supplied lesson evidence can support an observation, pattern, classroom mechanism, or next-step decision about Animal research ethics debate. It cannot by itself prove causation, establish a real clinical diagnosis, or justify action outside this classroom task.
Give one scientific reason C. elegans is a useful model for human biology, and one ethical concern that using it still raises.
Write an answer and pick a confidence to unlock the key.
Fast retrieval with instant answers, not the commit-then-reveal check above. Try each from memory first: write what you remember about the earlier units, then check yourself here.
Go further and get help▸
What today's skills lead to. These are real health-science careers this course builds toward. Tap one to see, on the US Department of Labor's O*NET site, what the job actually involves, what it pays, and how fast it is growing.
Why zebrafish and mice model human development, and the Atit lab's work.
Goes with: Why zebrafish and mice: animal models and the Atit lab
Use to see how IRF6's 3D shape lets it do its job.
Goes with: AlphaFold and UniProt: structure tells function
Debate whether the simplicity of C. elegans justifies its use over more complex animals; log two points per side.
Then submit your Exit ticket. Turn this in at the drop folder with your district Microsoft sign-in, or hand it to Mr. Mendoza in class. Both count as submitted. Doing the activity in myPLTW does not.
Class still runs. Complete the online activity above (it's self-guided). Need the concept taught without a teacher? Use this authoritative explainer:
Khan Academy: The science of biology (experimental design)You've passed Unit 2, so the optional extra-credit track is open. Complete reserved-unit work from home, including virtual labs, for extra credit. Each item shows its correct submission route.
Open the extra-credit track- CompleteEvery required part of the artifact is present, nothing left blank.
- AccurateThe science and the data are correct and match the evidence.
- Scientific reasoningYou explain your claim with evidence and reasoning (CER), not just an answer.
- Professional communicationClear, organized, labeled, and written the way a clinician or scientist would.
- SubmittedTurned in the right way, on the class site or handed to Mr. Mendoza in class, and confirmed. Not in Schoology: that is where the report-card grade appears later.