Clue 1: Orient yourself
Which connections can the map show directly?
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
Which connections can the map show directly?
Why it matters: Genetic results can change family counseling and research decisions. They must be interpreted without turning risk into destiny or an uncertain variant into a diagnosis. Today you practice the professional reasoning behind that work: A pedigree shows how a trait travels through a family; it does not prove that an isolated case is non-genetic.
On your WebXam
Reading standard pedigree symbols and classifying a case as isolated or familial
For life
To find the cause, change one thing and watch what changes.
Principle: Same look, different cause
Five principles we return to
Having it is not using it
Same instructions, different switches
Same look, different cause
Change one thing and watch
Boss or doorman?
Decides the result or only allows it
Held down, not gone
Remove the brake and it returns
Many roads, one ending
One result can begin many ways
Try the everyday version first
A neighborhood map shows connections, not hidden wiring
A neighborhood map shows which homes and streets connect. It usually does not show the buried pipes, wires, or private events inside each home.
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 important system remains hidden underground?
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
Why would one affected home not prove a random event?
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.
- 1Which connections can the map show directly?
- 2What important system remains hidden underground?
- 3Why would one affected home not prove a random event?
Tier 1 check
Finish with the everyday model
Use the everyday picture to answer today's question in plain words: Which connections can the map show directly?
You can complete today's required check without opening the technical details below.
Ready for the real names? Optional tier 2
Technical rules and limits
Rule 1: Record relationships before explaining cause.
Rule 2: An absent family pattern lowers some hypotheses but does not erase genetics.
Rule 3: One pedigree is evidence, not a final mechanism.
Where the analogy stops: Families are not neighborhoods. The analogy models visible relationships versus hidden causes.
Carry the previous idea forward
Mateo's cleft is best explained as a developmental pathway outcome with bounded evidence, not as one proven cause.
Today's technical takeaway
A pedigree shows how a trait travels through a family; it does not prove that an isolated case is non-genetic.
Now map the same rules onto biology
Build Mateo's three-generation pedigree
Connected homes
Biological relatives
Marked home
Affected family member
Hidden utilities
Unobserved variants and multifactorial risk
Educational illustration, not a clinical photograph or diagnostic result. Use the labeled evidence cards and claim ceiling.
Mateo's case file: evidence supplied in this lesson
GEN01-E1
Mateo is the only reported relative with a cleft across three generations.
Why it matters: The pedigree appears sporadic rather than strongly familial.
GEN01-E2
Both parents are unaffected.
Why it matters: A simple fully penetrant dominant pattern is not supported.
GEN01-E3
Isolated clefts can still involve inherited and new genetic risk factors.
Why it matters: No family history does not mean no genetic contribution.
Make the clinical decision
You are the intake genetic counselor.
Mateo's parents ask whether the empty family history means the cleft was only chance.
ASay the pedigree looks isolated but cannot exclude genetic risk.
BSay no relatives means genes played no role.
CDiagnose a dominant syndrome from one affected child.
Choose the counseling statement and cite the pedigree plus its limit.
Evidence required
GEN01-E1 + GEN01-E2 Claim ceiling
You may describe the observed family pattern. You may not exclude genetic contribution or name an inheritance model yet.Go deeper Optional tier 3
Everything required for today is above. Open these only if you want the explainer, source trail, or download files.
The everyday model and Tier 1 check are the complete required path for this lesson.
Use these checks to keep your place. They are not turned in through the portal.
Check off as you finish
- Worked through the everyday picture and answered its three questions.
- Completed the Tier 1 check in plain words.
Turn in: Genetics lesson 1: Chance or Genetic? Reading Mateo's Family Tree
Go to Schoology to turn this in.
Submit one PDF. Put your first and last name in the document header. Name the file: FirstName LastName - Assignment Title - YYYY-MM-DD.pdf.
Open Schoology PDF upload helpIf you cannot get in, see Mr. Mendoza. Do not skip the work.
Optional legacy technical materials Open only if you want the original notes, vocabulary, artifact, and CER work
Goal: Students will read and build a three-generation pedigree using standard symbols and use it to tell an from a familial (inherited) one when the family history is sparse and uncertain.
Know by the end
- A pedigree uses standard symbols (squares for males, circles for females, filled for affected, open for unaffected) so any geneticist can read a family at a glance.
- The proband is the person whose case brought the family in, marked with an arrow.
- An appears in one person with no affected relatives; a appears in more than one relative, often across generations.
- About 70% of clefts are and roughly 30% are part of a larger inherited picture.
1
Reading the symbols
Model start: A pedigree is a family diagram drawn with standard symbols, filled for affected and open for unaffected; the proband is marked with an arrow.
- A pedigree is a family diagram with squares for males, circles for females, filled for ____ and open for unaffected.
- The person who brings the family to attention is the proband, marked with an ____.
2
Isolated versus familial
- A is an when it appears in ______ person with no clearly affected relatives.
- It is a when it appears in ______ than one relative, often across generations.
3
What Mateo's tree shows
- Only Mateo is confirmed, his parents are unaffected, and the one possible relative is an unverified story, so the tree mostly reads as isolated.
- About 70% of clefts are isolated; a sparse pedigree cannot close the case, because a can be the first visible sign of a hidden syndrome.
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 explainer for this lesson
Why this source matters
This explanation gives you the background for today's idea without making you decode a research paper: A pedigree does not by itself prove a gene, but it tells us whether, and how hard, to look for one.
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.
Where this fits
Tested on (Ohio WebXam)
Genetics of Disease · 072130
PLTW lesson
MI · Genetics domain · Unit 2 How to Screen Your Genes, 2.1 Genetic Testing and Screening
WebXam domain
Molecular and Genetic Technology
Evidence to produce
Redraw Mateo's pedigree cleanly with standard symbols, label the proband with an arrow, fill only confirmed findings, mark the uncertain relative with a question mark, and write one chart sentence about whether the case looks isolated, familial, or uncertain.
Lab / skill
Medical Interventions (MI) · Principles of Biomedical Science (PBS)
Everything required for today's decision is already in the case file and plain-language explainer. The links below are original papers and database records for teachers and advanced readers, not assigned student reading.
- Claim: On this sparse history, Mateo's looks most likely (isolated / clearly inherited).
- Evidence: In the pedigree, the only confirmed finding is ____, and the parents are ____.
- Reasoning: A thin family history with one uncertain relative leaves an as the best first read, but it does not rule out a ____, which is why we still owe a screen.
How this is graded (rubric)
For: Redraw Mateo's pedigree cleanly with standard symbols, label the proband with an arrow, fill only confirmed findings, mark the uncertain relative with a question mark, and write one chart sentence about whether the case looks isolated, familial, or uncertain.
| 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 "Redraw Mateo's pedigree cleanly with standard symbols, label the proband with an arrow, fill only confirmed findings, mark the uncertain relative with a question mark, and write one chart sentence about whether the case looks isolated, familial, or uncertain.".
- 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.
What's next: Mateo's looks isolated and his parents are unaffected, but a cleft can sometimes be one feature of a hidden syndrome. What would a syndrome look like, and how would we screen for one?