When Could Mateo's Cleft Have Happened?
Developmental domain · Lesson 1 of 20 · Principles of Biomedical Science (PBS)
Today's goal: Place the major events of human craniofacial development on a week-by-week timeline (weeks 4 to 12) and identify the time window in which a lip or palate cleft must originate.
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.
Timeline brackets:
- Lip bracket: weeks 4 to 6, where the swellings grow toward each other and the upper lip closes.
- Palate bracket: week 6 (shelves begin) through week 12 (roof fully fused).
One-line read: Mateo's cleft of the lip and palate must have begun sometime between week 4 and week 12 of development, because that is the window when these structures are built and joined. Note for the chart: this tells us WHEN, not yet what or why.
This model shows the level of evidence and organization needed to complete: A labeled weeks 4 to 12 timeline with the lip window and the palate window bracketed and a one-sentence chart note.
- Name the variables and include units.
- Enter observations without changing the raw values.
- Check labels, calculations, and patterns before interpreting the data.
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: Which jobs must happen before the next phase can begin?
- 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: On a blank timeline strip (weeks 4 to 12), mark two brackets: one over the weeks when the lip is forming and closing, and one over the weeks when the is forming and fusing. Then write one sentence for Mateo's chart: "Mateo's of the lip and palate must have begun sometime between week ____ and week ____ of development, because that is the window when these structures are built."
- 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 "On a blank timeline strip (weeks 4 to 12), mark two brackets: one over the weeks when the lip is forming and closing, and one over the weeks when the palate is forming and fusing. Then write one sentence for Mateo's chart: "Mateo's cleft of the lip and palate must have begun sometime between week ____ and week ____ of development, because that is the window when these structures are built."".
- 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: Using a craniofacial timeline to bound the window when a cleft could begin.
- 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.