Mapping the Failure, Which Step Breaks for a Cleft Lip Versus a Cleft Palate
Developmental domain · Lesson 14 of 20 · Principles of Biomedical Science (PBS)
Today's goal: Map a cleft phenotype back to the exact developmental step that failed, and distinguish a single local fusion failure from a broad, multi-step patterning defect.
This is a model of the work you should turn in. Use it to check your own: match the structure and the level of detail, do not copy it. Your wording should be your own.
Step mapping: Mateo's complete left cleft of the lip and palate points to a failure that began at step 1, the lip-front fusion of the medial nasal and maxillary processes in weeks 4 to 6, and then continued into the secondary-palate fusion steps in weeks 6 to 12.
Pattern: His pattern looks like an isolated, local fusion failure rather than a body-wide patterning defect.
Evidence: His newborn exam found no other birth defects (no brain, heart, or limb findings), so only one face-building sequence is interrupted, which is what a local fusion failure looks like (PMID:26589921). (No diagnosis is named yet.)
This model shows the level of evidence and organization needed to complete: A three-sentence backward-mapping of a cleft phenotype to the failed step and a pattern classification.
- Write one defensible claim.
- Choose specific evidence that supports the claim.
- Explain the scientific rule that connects the evidence to the claim.
Keep the structure. Replace the question, facts, measurements, and evidence. Then recheck units, vocabulary, and whether the conclusion goes beyond the evidence.
The finished product above did not appear all at once. Here is the path from the question to the turned-in work, so you can follow the same steps.
- 1Start from today's question: Why can the same kind of opening come from several different failed steps?
- 2Work the Model and the Explore questions to reason it out before writing anything.
- 3Pull the specific evidence the product needs from the reading and any database you used.
- 4Write it up in the required format: Open Mateo's case summary: a of the lip and on the left side, and a that found no other birth defects. Write three sentences: (1) which step or steps his points to, (2) whether his pattern looks more like an isolated local or a body-wide , and (3) what evidence in his exam supports your answer. Do not name a diagnosis; just map the failure and classify the pattern.
- 5Check it against the rubric, then submit.
| 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. |
- CompleteProficient: Nothing is left blank: the model fills every part of "Open Mateo's case summary: a complete cleft of the lip and palate on the left side, and a newborn exam that found no other birth defects. Write three sentences: (1) which step or steps his cleft points to, (2) whether his pattern looks more like an isolated local fusion failure or a body-wide patterning defect, and (3) what evidence in his exam supports your answer. Do not name a diagnosis; just map the failure and classify the pattern.".
- 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.
One exam-style question that uses exactly what you practiced today. Try it before you reveal the answer, then read why each choice is right or wrong.
Tap an answer to see the full explanation. Nothing is recorded or graded.
It builds this reusable test skill: Distinguishing a local fusion failure from a broad patterning defect.
- Name the concept or data pattern being tested.
- Cross out choices that violate that rule or the evidence.
- Justify the best remaining choice before checking the answer.