Rough draft.This research track is under review with Dr. Atit's lab. Content and sequence may still change.
Here's an example of what's due today
Measuring Inheritance Over Time and in Twins
Experimental Design domain · Lesson 5 of 20 · Biomedical Innovations (BI)
Today's goal: Students will explain how a cohort study follows exposure forward to outcome, how a twin study compares identical and fraternal concordance to estimate heritability, and what high heritability does and does not tell us about a single gene.
Learn first
What a finished product looks like
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.
Twin-study briefing
Completes: A team briefing that reads the twin concordance numbers and separates population heritability from family recurrence risk.
Twin-study briefing for the surgeons and counselor:
- Identical (monozygotic) concordance = 50 percent; fraternal (dizygotic) concordance = 8 percent; identical is much higher.
- Why this points to genes, not the shared womb: both identical and fraternal twins share a womb at the same time, so shared environment is roughly held constant; the big thing that differs is the amount of DNA shared, so the large concordance gap is attributable to genes, giving heritability above 90 percent.
- Counselor's question, honest answer: a population heritability above 90 percent is not one family's recurrence risk. Heritability describes how much of the variation across the whole population is explained by genes; the per-sibling chance for Mateo's family is far lower than 90 percent, and the 50 percent discordance in identical twins shows non-genetic factors still operate.
Also due today: Flag that high heritability is compatible with many small-effect genes, not a single pass-it-down gene.
Learn first
How this was built, step by step
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: How can a study measure risk forward in time, and how can comparing twins separate inherited risk from environmental risk?
- 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: Present the twin result at the team meeting: state the identical and fraternal concordances and which is higher, explain in one sentence why this points to genes rather than the shared womb, and answer in two sentences whether heritability above 90 percent means Mateo's future siblings will almost certainly have a .
- 5Check it against the rubric, then submit.
How this is graded (rubric)
For: Present the twin result at the team meeting: state the identical and fraternal concordances and which is higher, explain in one sentence why this points to genes rather than the shared womb, and answer in two sentences whether heritability above 90 percent means Mateo's future siblings will almost certainly have a cleft.
| 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 the right way (Schoology for routine work) 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 "Present the twin result at the team meeting: state the identical and fraternal concordances and which is higher, explain in one sentence why this points to genes rather than the shared womb, and answer in two sentences whether heritability above 90 percent means Mateo's future siblings will almost certainly have a cleft.".
- 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 turned in on Schoology and confirmed.
Check yourself
WebXam problem for today's skill
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.
WebXam-style domain: Epidemiology and heritabilitySelf-check skill: Interpreting twin concordance and what heritability does and does not mean
A twin study finds 50 percent concordance for clefting in identical twins and 8 percent in fraternal twins, with heritability above 90 percent. What is the best interpretation?
Tap an answer to see the full explanation. Nothing is recorded or graded.