1. Recall
What can an unspecialised stem cell do?
Help beside the question
Read or point first. Divide and develop a specialised function.
Answer guidance
Divide and differentiate.
Stem cells: evidence before judgement
Learning objective
Distinguish a measured result, a possible application and a claim that exceeds the evidence.
40 minutes · one route · start from what you show today. Point, speak, sign, draw, write or direct an adult. An adult may read or scribe your exact words. Choose one route; do not complete all three.
LAUNCH · GCSE BIOLOGY FOUNDATION · W11 · LESSON 1 · 4 MINUTES
Four clues to start
Supported · 4 questions
2. Evidence
Which is a measurement: “12 improved” or “this is a miracle”?
Help beside the question
Read or point first. One is a count; one is promotional language.
Answer guidance
“12 improved” is a count, provided improved is defined.
3. Comparison
Why include a comparison group?
Help beside the question
Read or point first. Ask what might happen without the new treatment.
Answer guidance
To help judge whether an outcome differs from what happens under comparison conditions.
4. Limit
Does a cell-dish result prove a treatment works in people?
Help beside the question
Read or point first. Separate laboratory and clinical evidence.
Answer guidance
No.
Standard · 4 questions
1. Recall
What can an unspecialised stem cell do?
Help beside the question
Divide and develop a specialised function.
Answer guidance
Divide and differentiate.
2. Evidence
Which is a measurement: “12 improved” or “this is a miracle”?
Help beside the question
One is a count; one is promotional language.
Answer guidance
“12 improved” is a count, provided improved is defined.
3. Comparison
Why include a comparison group?
Help beside the question
Ask what might happen without the new treatment.
Answer guidance
To help judge whether an outcome differs from what happens under comparison conditions.
4. Limit
Does a cell-dish result prove a treatment works in people?
Help beside the question
Separate laboratory and clinical evidence.
Answer guidance
No.
Stretch · 4 questions
1. Recall
What can an unspecialised stem cell do?
Help beside the question
Divide and develop a specialised function.
Answer guidance
Divide and differentiate.
2. Evidence
Which is a measurement: “12 improved” or “this is a miracle”?
Help beside the question
One is a count; one is promotional language.
Answer guidance
“12 improved” is a count, provided improved is defined.
3. Comparison
Why include a comparison group?
Help beside the question
Ask what might happen without the new treatment.
Answer guidance
To help judge whether an outcome differs from what happens under comparison conditions.
4. Limit
Does a cell-dish result prove a treatment works in people? Give a reason.
Help beside the question
Separate laboratory and clinical evidence.
Answer guidance
No. Accept a scientifically correct reason that uses the relevant model or evidence.
LAUNCH · GCSE BIOLOGY FOUNDATION · W11 · LESSON 1 · 4 MINUTES
Choose a first idea
Which statement stays within the evidence?
Think or discuss first. No answer chosen yet.
LAUNCH · GCSE BIOLOGY FOUNDATION · W11 · LESSON 1 · 5 MINUTES
Watch the model
In a simulated study, did more people improve in the treatment group than in the comparison group?
Worked explanation · reveal after thinking
The 20-person groups and all outcomes are simulated for arithmetic and evaluation. Improvement and adverse events may occur in the same person. They are not mutually exclusive outcomes. Do not diagnose, recommend treatment, ask for family histories or require pupils to disclose a personal ethical view.
32-second silent captioned explainer · optional
No sound or autoplay. Use instead of part of the modelling time, not as an extra activity.
Full transcript
Ask a bounded question. In a simulated study, did more people improve in the treatment group than in the comparison group?
Read the denominator. Twelve of twenty improved in the treatment group. Six of twenty improved in the comparison group.
Check possible harm. Four of twenty had an adverse event in the treatment group; one of twenty in the comparison group.
Keep limits visible. The groups are small and follow-up lasts eight weeks. These invented data do not establish long-term safety or a cure.
LAUNCH · GCSE BIOLOGY FOUNDATION · W11 · LESSON 1 · 5 MINUTES
Sort using the evidence
Choose a card, then choose a group. Explain one placement using its clue.
Drag, or use Tab and Enter to select a card and its group. Pointing or adult-directed placement works too.
Measured result
Conditional application
Overclaim
Choose a card first.
Read the card clues
12 of 20 participants improved: A measured outcome in this simulated group.
4 of 20 had an adverse event: A simulated safety observation.
The approach might help repair tissue: A possible use that needs further evidence.
A larger study could test the benefit: A justified next research step, not proof of benefit.
It will cure all patients: A universal outcome is not established.
No risk was mentioned, so there is no risk: Absence of a report is not proof of absence.
Would a small change help? · optional
Ask the lesson teacher for clearer labels, fewer cards, reading help, an adult-directed model or more thinking time. Your teacher will explain what can change, try it and check its effect. Ask privately or pass; no extra form is needed.
Group explanations · reveal after sorting
12 of 20 participants improved → Measured result. A measured outcome in this simulated group.
4 of 20 had an adverse event → Measured result. A simulated safety observation.
The approach might help repair tissue → Conditional application. A possible use that needs further evidence.
A larger study could test the benefit → Conditional application. A justified next research step, not proof of benefit.
It will cure all patients → Overclaim. A universal outcome is not established.
No risk was mentioned, so there is no risk → Overclaim. Absence of a report is not proof of absence.
LAUNCH · GCSE BIOLOGY FOUNDATION · W11 · LESSON 1 · 4 MINUTES
Work through one example
Worked example
A laboratory report says cells carry a marker. A headline says everyone will be cured. Compare the claims.
Step 1
The observed result concerns a marker in cultured cells.
Step 2
The headline concerns clinical outcomes in all people.
Step 3
The report does not test the headline’s claim.
Step 4
Keep the observation; replace the guarantee with a conditional research question.
LAUNCH · GCSE BIOLOGY FOUNDATION · W11 · LESSON 1 · 4 MINUTES
Evidence ladder
Order the three cards by what they actually test, not by how exciting they sound. What extra evidence is needed between stages?
| Card | Observation |
|---|---|
| A: dish | Cells show a marker in a laboratory dish |
| B: small study | Outcomes recorded in a small group of people |
| C: repeated comparisons | Benefits and harms studied in repeated suitable comparisons |
Ethics reading and contrasting considerations
Embryonic stem-cell research can involve using early embryos; views differ about their moral status and the acceptability of using them for possible health benefits. Informed consent, fairness and careful evidence matter. Adult stem cells avoid that particular embryo-source concern but usually have more limited potential. You may explain contrasting arguments without stating a personal belief.
Worked explanation · reveal after thinking
A studies cells; B begins to study human outcomes; C can provide stronger clinical evidence when well designed. None alone guarantees every person benefits or that all long-term risks are known.
LAUNCH · GCSE BIOLOGY FOUNDATION · W11 · LESSON 1 · 10 MINUTES
Show your understanding
Supported · choose one route
1. Label
Sort the six claims into the three groups.
Choose a label for each claim: measured / possible / overclaim. Point to words that support your choice.
2. Ask
Write two checks for a treatment headline.
Choose two checks: group size / comparison / follow-up / harm. Turn each into a question.
3. Repair
Rewrite “stem cells cure everything” as an evidence-aware statement.
Cross out “everything”. Complete: this result may help with ___, but we still need evidence about ___.
Standard · choose one route
1. Label
Sort the six claims into the three groups.
Underline the measurable value or the conditional word.
2. Ask
Write two checks for a treatment headline.
One about benefit; one about possible harm.
3. Repair
Rewrite “stem cells cure everything” as an evidence-aware statement.
Use some / may / requires evidence.
Stretch · choose one route
1. Label
Sort the six claims into the three groups.
Underline the measurable value or the conditional word.
2. Ask
Write two checks for a treatment headline.
One about benefit; one about possible harm.
3. Evaluate absence
A report lists no adverse events. Give two reasons that this is not proof of zero risk.
Think size, time and reporting.
LAUNCH · GCSE BIOLOGY FOUNDATION · W11 · LESSON 1 · 4 MINUTES
Two small checks
Supported · 2 questions
1. Distinguish
What is the difference between a result and an application claim?
Help beside the question
Use: both ___; a difference is ___. What was measured versus how it might be used.
Answer guidance
A result describes the observed evidence; an application claim proposes a possible use and needs relevant evidence.
2. Evaluate
Give one question to ask before accepting a stem-cell “cure” claim.
Help beside the question
Use: the evidence shows ___, but cannot yet show ___. Think group size, comparison, harms or follow-up.
Answer guidance
For example: Was there a suitable comparison group and evidence of benefits and harms over enough time?
Standard · 2 questions
1. Distinguish
What is the difference between a result and an application claim?
Help beside the question
What was measured versus how it might be used.
Answer guidance
A result describes the observed evidence; an application claim proposes a possible use and needs relevant evidence.
2. Evaluate
Give one question to ask before accepting a stem-cell “cure” claim.
Help beside the question
Think group size, comparison, harms or follow-up.
Answer guidance
For example: Was there a suitable comparison group and evidence of benefits and harms over enough time?
Stretch · 2 questions
1. Distinguish
What is the difference between a result and an application claim?
Help beside the question
What was measured versus how it might be used.
Answer guidance
A result describes the observed evidence; an application claim proposes a possible use and needs relevant evidence.
2. Evaluate absence
A report lists no adverse events. Give two reasons that this is not proof of zero risk.
Help beside the question
Think size, time and reporting.
Answer guidance
The study may be too small or short to detect rare or later harms; reporting may also be incomplete.
Keep one useful science explanation. No additional participation record is required.