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
Why can the same kind of opening begin with several different missed steps?
Why it matters: The same kind of opening can begin with different missed steps. Shape alone cannot tell a care team which cause to investigate, so careful classification protects patients from a one-cause guess.
On your WebXam
You can use a final structure to narrow a missed developmental step without assuming one cause.
For life
One result can have many causes; the outcome alone never tells you which.
Principle: Many roads, one ending
Try the everyday version first
Many roads, one ending
A stopped assembly line shows the checkpoint where work ended, but it does not name the failed part. Several earlier problems can stop the line at the same place.
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
Explain why one stopped checkpoint can narrow the search without proving which part failed.
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 3The Case Opens, SeptemberLens: PBS
What a cleft is, and why timing matters
Discovery question
Why can the same kind of opening begin with several different missed steps?
Many roads, one ending. The opening shows where building stopped, but it does not reveal one cause by itself.
Before this page, you should know
- Five prominences (one frontonasal, two maxillary, two mandibular) grow and fuse to form the face.
- The five prominences are a simplified map. The upper lip and primary depend especially on among the maxillary and the medial nasal prominences; the mandibular prominences mainly form the lower jaw.
If not, review
Today's new idea is only
Many roads, one ending. The opening shows where building stopped, but it does not reveal one cause by itself.
Goal: Use the final shape to narrow the missed building step while keeping more than one possible cause open.
Know by the end
- A is the result when a step does not complete during its critical window.
- Clefts can be (one side) or (both sides), and can involve lip only, only, or both.
- Genes provide the instructions cells need to fuse; IRF6 is one gene with a clear job in this process.
- Knowing the exact failed step is the first move toward correcting it.
1
Naming the difference
Model start: means one side; Mateo's lip is on the left side only.
- Define and , and label which Mateo has.
- Sort three example cases into lip only, only, or both.
2
A step that did not finish
Model start: A happens when two edges do not fuse during their critical window.
- Complete the sentence: A happens when ____ does not ____ during its critical window.
- Explain why the same outcome (a ) can have more than one cause.
3
A first look at a cause
Model start: IRF6 carries the instruction for a that the skin-like cells of the lip and need in order to fuse.
- Open the IRF6 gene card and write, in one line, what IRF6 does.
- Predict how a broken instruction for IRF6 could leave a .
MedlinePlus
Open the tool Plain-language explanations of a gene or condition, written for patients and families.
When you use this: Use this when a research paper is too dense, or when you need to explain a finding to Mateo's family in everyday words.
What the screen looks like
Step by step
- 1Open medlineplus.gov/genetics and search the gene or condition (IRF6).
- 2Read the summary written in everyday words.
- 3Note the conditions the gene is linked to at the bottom of the page.
Capture these fields
- Topic: IRF6 gene
- Plain-language summary: IRF6 helps the tissues of the face join correctly before birth.
- Linked conditions: Van der Woude syndrome; nonsyndromic cleft
How to read it: Start here when a research paper is too dense. MedlinePlus gives you the gist in everyday words so you can go back to the harder source knowing what it is about.
Lost? About MedlinePlus Genetics NCBI Gene
Open the tool The full reference record for a gene: its official symbol, ID, location, and what it does.
When you use this: Use this first, when you have a gene name and need its official ID and address. It is the home base every other database points back to.
What the screen looks like
Step by step
- 1Go to ncbi.nlm.nih.gov/gene and type the gene symbol IRF6 in the search box, then press Search.
- 2Open the top result whose organism is Homo sapiens (human).
- 3At the top of the record, read three things and write them down: the official symbol, the Gene ID number, and the location ( band).
Capture these fields
- Symbol (official gene name): IRF6
- Gene ID (the stable number): 3664
- Location (chromosome band): 1q32.2
- Summary (one line on its job): A transcription factor needed for the skin-surface cells that let the lip and palate fuse.
How to read it: The symbol and Gene ID let you find the exact same gene in every other database. The location should match the band you mapped (1q32). The summary tells you the gene's job in one sentence.
Lost? NCBI Gene help manual (how to use the Gene database)
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: Use the final shape to narrow the missed building step while keeping more than one possible cause open.
How this is graded (rubric)
For: Use the final shape to narrow the missed building step while keeping more than one possible cause open.
| 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 "Use the final shape to narrow the missed building step while keeping more than one possible cause open.".
- 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
Why can the same kind of opening begin with several different missed steps?
A stopped assembly line shows the checkpoint where work ended, but it does not name the failed part. Several earlier problems can stop the line at the same place.
Many roads, one ending. The opening shows where building stopped, but it does not reveal one cause by itself.
- A is the result when a step does not complete during its critical window.
- Clefts can be (one side) or (both sides), and can involve lip only, only, or both.
- Genes provide the instructions cells need to fuse; IRF6 is one gene with a clear job in this process.
- Knowing the exact failed step is the first move toward correcting it.
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: Many roads, one ending. The opening shows where building stopped, but it does not reveal one cause by itself.
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.