Clue 1: Orient yourself
What are the main parts, stages, or choices in this model?
Use the labels and the picture's left-to-right, near-to-far, or before-and-after order. Name only what you can point to.
The question
When can a fish or mouse answer a question about a human face, and where does the comparison stop?
Why it matters: A model organism is useful only for the process it truly shares with humans. Naming that boundary protects patients from conclusions that worked in a fish or mouse but have not yet been shown in people.
On your WebXam
You can judge a model organism by the process it shares with humans and state its limits.
For life
To find the cause, change one thing and watch what changes.
Principle: Same look, different cause
Try the everyday version first
Same look, different cause
A small bridge model can test how a beam carries weight, but it cannot copy every force on a full bridge in a storm.
Do not jump to the biology yet. Treat the picture as a small system. Track its parts, follow one change at a time, and keep more than one explanation open until the picture supplies a way to separate them.
Clue 2: Trace one change
What changes while the other parts stay the same?
Follow one object, stage, or path. Point to the first place where the situation changes instead of jumping to the ending.
Clue 3: Keep the cause open
What check would separate two explanations that still fit the picture?
List more than one explanation that still fits. Name the extra observation that would help you separate those possibilities.
Now inspect the illustration
Work from the visible evidence. A useful answer names the part of the picture that supports it and leaves unknown causes open.
- 1What are the main parts, stages, or choices in this model?
- 2What changes while the other parts stay the same?
- 3What check would separate two explanations that still fit the picture?
Tier 1 check
Finish with the everyday model
Name one shared process that makes a model useful and one limit that keeps its answer narrow.
Answer in plain words. You can finish this required check without opening either optional section below.
Ready for the real names? Optional tier 2
Craniofacial Research Track
Session 16The Fix, January (intensive)Lens: Biomedical Innovations
Why zebrafish and mice: animal models and the Atit lab
Discovery question
When can a fish or mouse answer a question about a human face, and where does the comparison stop?
Same look, different cause. A model is useful when it shares the step being tested, but a model result is never the same as evidence from a person.
Before this page, you should know
- Facial must happen during a critical window, about weeks 4 to 12. In theory, a correction would have to act during that same window. In humans this is not an approved or near-term treatment for clefting.
- A delivery vector is the (such as a virus or a nanoparticle) that gets the editing tool into the right cells.
Today's new idea is only
Same look, different cause. A model is useful when it shares the step being tested, but a model result is never the same as evidence from a person.
Goal: Judge one by the process it shares with humans and state what the model can and cannot show.
Know by the end
- A is a species studied because its biology is similar enough to ours to teach us about human development.
- Zebrafish and mice build their faces using the same core developmental program (, , and the same key genes).
- Because the program is shared, a gene like IRF6 or does a similar job across these species.
- -based perturbation and rescue studies in animal models are how craniofacial gene function gets tested before any human use; correction remains and is gene-specific and model-specific.
- Craniofacial labs, including Dr. Atit's, study how these cells and signals build the head, which grounds the case in real research.
1
Why a fish or a mouse counts
Model start: A is a species we study because its biology is close enough to ours to teach us about human development.
- Define in one sentence.
- List two reasons a zebrafish or mouse face is a fair stand-in for studying human facial development.
2
The shared program
Model start: Zebrafish, mice, and humans all use cranial and the same step, so the same genes matter in each.
- Name the shared pieces: the , the step, and a shared gene such as IRF6 or .
- Explain why a shared gene doing a shared job is what makes the model trustworthy.
3
From model to the Atit lab
Model start: Dr. Atit's lab studies how cranial and signals build the bones and tissues of the head.
- Open Dr. Atit's published craniofacial research and write one line on what kind of question her lab asks.
- Explain how testing a correction in an is a step that has to come before any human use.
Level 1, Guided
Use the sentence starters, a word bank from the vocabulary, a labeled diagram, and the exact source link.
Level 2, Collaborative
Complete a partly blank model or table and explain it.
Level 3, Independent
Make a claim from a new example or an unfamiliar entry in the same database.
Team roles
- Manager: keeps the group moving
- Recorder: writes the shared model or table
- Evidence checker: verifies each claim against the source
- Reporter: explains the group's reasoning
Process reflection
- What evidence changed your thinking today?
- What did your group disagree about, and how did you resolve it?
- What question is still unresolved?
By the end of this session, submit ONE of: a labeled diagram with a 2-sentence explanation; a claim, evidence, reasoning paragraph; a completed data table from a real database; or a one-question exit ticket using today's vocabulary.
Meets standard if your explanation correctly connects structure, timing, gene or protein function, or evidence source to Mateo's case: Judge one animal model by the process it shares with humans and state what the model can and cannot show.
How this is graded (rubric)
For: Judge one animal model by the process it shares with humans and state what the model can and cannot show.
| Criterion | Proficient | Developing | Beginning |
|---|---|---|---|
| Complete | Every required part of the artifact is present and filled in. | Most parts are present, but one is missing or left blank. | Several parts are missing. |
| Accurate | The science and data are correct and match the evidence. | Mostly correct, with a small factual slip. | Key science or data is wrong. |
| Scientific reasoning (CER) | States a claim, backs it with specific evidence, and explains the reasoning. | Has a claim and evidence, but the reasoning is thin or missing. | Gives an answer with no evidence or reasoning. |
| Professional communication | Clear, organized, and labeled the way a clinician or scientist would write it. | Readable but disorganized or missing labels. | Hard to follow. |
| Submitted | Turned in through the route named under Submit here and confirmed. | Turned in, but in the wrong place or unconfirmed. | Not turned in. |
How the model answer scores against this rubric
- CompleteProficient: Nothing is left blank: the model fills every part of "Judge one animal model by the process it shares with humans and state what the model can and cannot show.".
- AccurateProficient: Every number and claim matches the case evidence.
- Scientific reasoning (CER)Proficient: It names a claim, cites the specific evidence, and explains the reasoning, not just the answer.
- Professional communicationProficient: It is organized and labeled like a real chart note.
- SubmittedProficient: It would be attached to your class form or handed in, and confirmed.
Go deeper Optional tier 3
Everything required is above. Open this section only if you want the research reading and source trail.
Student reading
The idea in plain English
When can a fish or mouse answer a question about a human face, and where does the comparison stop?
A small bridge model can test how a beam carries weight, but it cannot copy every force on a full bridge in a storm.
Same look, different cause. A model is useful when it shares the step being tested, but a model result is never the same as evidence from a person.
- A is a species studied because its biology is similar enough to ours to teach us about human development.
- Zebrafish and mice build their faces using the same core developmental program (, , and the same key genes).
- Because the program is shared, a gene like IRF6 or does a similar job across these species.
- -based perturbation and rescue studies in animal models are how craniofacial gene function gets tested before any human use; correction remains and is gene-specific and model-specific.
- Craniofacial labs, including Dr. Atit's, study how these cells and signals build the head, which grounds the case in real research.
This lesson reading is written from the vetted sources in the advanced citation trail below.
Everything you need for today is on this page. These links are optional.
What to read
Read the short plain-language explanation written for this lesson. Plain-language reading for this session
Why this source matters
This explanation gives you the background for today's idea without making you decode a research paper: Same look, different cause. A model is useful when it shares the step being tested, but a model result is never the same as evidence from a person.
Words to unlock first
Reading moves
- Skim the title and abstract first to get the gist.
- Circle the one sentence that states the main claim.
- Box the evidence the authors give for that claim.
- Mark one sentence that confuses you, and move on.
Stop point
Stop after the final 'Use it now' section. The research citations are available separately for advanced readers.
Your output
Write one claim-evidence sentence: state the main idea, then name the example or evidence that supports it.
These records and papers document the science. They are not assigned student reading. Use the plain-language lesson reading above unless your teacher asks you to inspect an original source.