Lessons
00:00
Opening

LAUNCH · SCIENCE · Lesson 3 of 10

A crop makes a pest-control protein

Learning intention

Describe genetic engineering and use evidence to weigh a specific benefit, a risk and an unanswered question.

What changed: the DNA, the whole species, or the weather?

Today: explain the change and assess a trial.

Success looks like

  • Describe genetic engineering as a direct alteration of an organism’s DNA/genome.
  • Connect a genetic change to a useful product or trait without claiming a change of species.
  • Give an evidence-based provisional decision with one benefit, one risk and one further check.
Retrieval

LAUNCH · SCIENCE · Lesson 3 of 10

Retrieve genes and selection

R1. What is a gene?

R2. What do humans choose in selective breeding?

R3. Can a resistance trait become more common over generations?

I do

LAUNCH · SCIENCE · Lesson 3 of 10

What genetic engineering means

Laboratory technologies alter the genome directly.

DNA may be added, changed or removed.

A gene transfer is one example, not the only method.

Engineering changes DNA directlyThree conceptual changes to a DNA sequence: adding a DNA segment, changing bases, or deleting a segment. Different methods perform these changes. Diagrams are symbolic blocks, not actual DNA sequences or laboratory protocols.Genetic engineering: alter the genomeA genome is all an organism’s genetic information.Add asegmentChange DNADelete DNACross-species transfer is only one method.
Engineering changes DNA directly
Diagram description

Three conceptual changes to a DNA sequence: adding a DNA segment, changing bases, or deleting a segment. Different methods perform these changes. Diagrams are symbolic blocks, not actual DNA sequences or laboratory protocols.

I do

LAUNCH · SCIENCE · Lesson 3 of 10

Connect the change to the trait

A gene can affect the protein a cell makes.

A Bt crop can make a protein harmful to certain insect pests.

Testing checks whether the intended effect occurs.

A DNA change can alter a characteristicConceptual gene expression chain: a changed or added functional gene can alter the protein made and therefore a characteristic. It may need appropriate control sequences and cellular conditions; not every DNA change changes phenotype.Connect a genetic change to its effectDNAinformationProteinmade by cellsPossibletrait changeA Bt gene can enable a crop to make a proteinthat harms certain insect pests.Simplified model; the change must be checked.
A DNA change can alter a characteristic
Diagram description

Conceptual gene expression chain: a changed or added functional gene can alter the protein made and therefore a characteristic. It may need appropriate control sequences and cellular conditions; not every DNA change changes phenotype.

I do

LAUNCH · SCIENCE · Lesson 3 of 10

The product is the protein

Engineered microbial cells can make human insulin.

The product is recovered, purified and checked.

The cells do not become human.

A useful protein, not a change of speciesConceptual recombinant insulin production: genetic instructions for human insulin are introduced into suitable microbial cells, which produce protein. The insulin is recovered, purified and checked; patients receive medicine, not the engineered organisms. No laboratory protocol is supplied.Example: make a useful medicineGenetic instructionfor human insulinSuitable microbialcells produceinsulinRecover, purifyand checkthe medicineThe cells remain microbes.The gene is information.Insulin is the product.Conceptual model, not a practical method.
A useful protein, not a change of species
Diagram description

Conceptual recombinant insulin production: genetic instructions for human insulin are introduced into suitable microbial cells, which produce protein. The insulin is recovered, purified and checked; patients receive medicine, not the engineered organisms. No laboratory protocol is supplied.

I do

LAUNCH · SCIENCE · Lesson 3 of 10

Predict a risk using biology

Pest populations contain inherited variation.

Resistant survivors can reproduce.

Resistance may spread, so monitor it.

The crop and the pest can both changeA conceptual resistance mechanism across pest generations. The crop kills susceptible pests; rare inherited resistance variants can survive and reproduce, making resistance more common. The diagram shows a mechanism, not numerical data.Why resistance needs monitoringBeforeexposurePests vary.Some inheritedvariants resistthe Bt protein.SelectionSusceptiblepests are killed.Resistant pestsmay survive.LatergenerationsSurvivorsreproduce.Resistance canbecome common.Monitoring and resistance-management strategiescan delay resistance, but not promise zero risk.
The crop and the pest can both change
Diagram description

A conceptual resistance mechanism across pest generations. The crop kills susceptible pests; rare inherited resistance variants can survive and reproduce, making resistance more common. The diagram shows a mechanism, not numerical data.

Continue within this stage’s shared time.

We do

LAUNCH · SCIENCE · Lesson 3 of 10

Trial board: what does the evidence show?

W1. Compare damage and yield in this trial.

W2. Which claim is justified: promise, success here, or proof everywhere?

Use exact quantities.

Constructed sample data: means from three matched plot pairs at one site in one season; neither crop received target-insect spray. Other growing conditions matched.
CropTarget-pest damaged plants /100Mean grain yield (t/ha)
Comparison non-GM306.9
Bt GM87.9
We do

LAUNCH · SCIENCE · Lesson 3 of 10

Spend your two next checks

W3. Choose two: repeat sites/seasons; monitor resistance; measure crop colour; count likes online.

Defend how each choice reduces uncertainty.

Acknowledge a further question your choices leave open.

Continue within this stage’s shared time.

Hinge

LAUNCH · SCIENCE · Lesson 3 of 10

Which explanation is scientifically sound?

Choose the statement you would keep in a textbook.

You do

LAUNCH · SCIENCE · Lesson 3 of 10

Write a provisional recommendation

Use the mechanism and crop-trial evidence.

Recommend a next step with a benefit, risk and missing check.

Choose your response route with the teacher.

You do

LAUNCH · SCIENCE · Lesson 3 of 10

A recommendation is more than a vote

In this trial, … so a possible benefit is …

However, … could happen because …

I recommend … while checking …

Continue within this stage’s shared time.

You do

LAUNCH · SCIENCE · Lesson 3 of 10

Optional Higher-tier extension

Ready for more? Use the extra mechanism box on the Stretch page.

Explain a vector, restriction enzyme and ligase.

This detail is not needed for today’s core success.

Continue within this stage’s shared time.

Review

LAUNCH · SCIENCE · Lesson 3 of 10

Review a recommendation fairly

Does it explain the genetic change?

Does it separate evidence from uncertainty?

Use one audience question to sharpen the next step.

Carry a good question into the next lesson" data-timer="0" data-type="" data-teacher="Shares the3-minute review. This is a bridge to the SoW Week4 research/digital-slideshow evaluation, not its replacement. Record a question pupils can later research using checked sources, such as effectiveness in another climate or effects on non-target organisms." data-prompt="Carry a good question into the next lesson">Review

LAUNCH · SCIENCE · Lesson 3 of 10

Carry a good question into the next lesson

Which crop and trait are being assessed?

What evidence would answer our unanswered question?

Who would be affected by the decision?

Continue within this stage’s shared time.

Exit

LAUNCH · SCIENCE · Lesson 3 of 10

Explain, support, qualify

E1. Define genetic engineering in one sentence.

E2. Give one measured benefit in the trial.

E3. Give one risk and a useful next check.

My science task sheets

Choose one route with your teacher. Shared evidence and the exit sheet appear in every route. Your work stays here while the page is open; save it before closing.

Shared evidence | Bt crop trial board

This is a paper evaluation. Crop-trial numbers are constructed sample data, not observations from a named commercial product.

Mechanism

Some Bt crops contain added genetic information originating from Bacillus thuringiensis. The crop can produce a protein that harms particular insect pests. It does not become a bacterium and is not protected from every pest.

Possible resistance risk

Pests vary. Inherited variants that survive exposure may reproduce, so resistance can become more common over generations. Monitoring and resistance-management strategies aim to delay this.

Evidence limits

The trial covers one site and one season. It reports damage and yield, not food safety or effects on every non-target species. Neither crop received target-insect spray. All applications need evidence relevant to the crop, trait and setting.

CropTarget-pest damaged plants /100Mean grain yield (t/ha)
Comparison non-GM306.9
Bt GM87.9

Constructed sample data: means from three matched plot pairs. Water, fertiliser and planting density were matched. One site; one season.

Supported route | Build your recommendation

Use the shared evidence. You may speak, annotate or dictate. Words: DNA • protein • target pest • evidence • resistance • test.

Standard route | Evidence-based trial recommendation

Write for a grower who needs a clear reasoned next step, not a slogan.

Stretch route | Evaluate and extend

Choose T1–T3 for deeper evaluation. T4 is an optional Higher-tier mechanism extension; it is not required for the Foundation core.

Constructed sample data: original trial mean yield non-GM6.9 versus Bt7.9 t/ha; target-pest damage30 versus8 plants per100. A second season at another site gives non-GM7.1 versus Bt7.0 t/ha and damage5 versus4 plants per100. Different pest pressure and growing conditions may matter.

Optional Higher-tier mechanism box: in one classical method, a restriction enzyme cuts DNA at particular sequences. Compatible short single-stranded ends (“sticky ends”) can pair. Ligase joins the DNA backbone. A vector, such as a plasmid, carries the DNA into a suitable cell. This is one conceptual method, not all genetic engineering.

Exit and reflection | A precise judgement

Answer independently. A short oral or annotated answer is valid.

My next useful step is…
Slide 1

TA Brief

Current stage

Objective

Describe genetic engineering and use evidence to weigh a specific benefit, a risk and an unanswered question.

Preparation

Method precautions

Practical alternative

All evidence is supplied for offline use. Discuss, point, annotate or dictate instead of cutting cards or writing extended prose.

Access and regulation

Supported: Same scientific objective, with chunked cards, word bank, read-aloud access and short evidence stems. Accept accurately explained oral or annotated responses.

Standard: Use two evidence sources and a reasoned explanation independently.

Stretch: Evaluate limitations, explain a mechanism and transfer to unfamiliar evidence.

Regulation: Offer solo or partner working and a quiet response route. Preview the sequence; allow a brief reset and re-entry at the next numbered task. No compulsory performance or timed competition.

Teacher answers

R1–R3 retrieval

R1 a gene is a section of DNA containing genetic information; many code for proteins. R2 humans choose which organisms reproduce for desired inherited traits. R3 yes: inherited variants that survive and reproduce can become more common in later generations.

W1 / S2 / M3 data comparisons

Constructed trial: damage falls from30 to8 plants per100, a difference of22 plants per100 (22 percentage points if expressed as percentages). Mean yield rises from6.9 to7.9 t/ha, a difference of1.0 t/ha. These are means in one site/season, not universal outcomes. Optional relative damage reduction22/30×100≈73%; do not confuse this with22 percentage points.

W2 justified claim / S3 benefit

“This trial shows a promising benefit here” is supported: less target-pest damage and higher mean yield. “Success everywhere” or “proof that all GM crops are safe” is not. Neither group received target-insect spray, so this table does not directly measure a reduction in spraying. Future reduced spray use is a possible benefit requiring its own comparison.

W3 next checks

Repeat across sites/seasons tests whether the result generalises; monitor resistance tests whether pest susceptibility/effectiveness changes across generations. Crop colour is not relevant to the stated performance question without a further mechanism. Online likes measure popularity, not biological outcomes. These two checks still leave questions such as non-target effects and crop-specific safety assessment.

S1 / E1 definition

Genetic engineering directly alters an organism’s DNA/genome using laboratory technology. A Bt gene can enable the crop to make a protein that harms particular insect pests. DNA may be added, changed or deleted; not all engineering transfers DNA between species.

S4 resistance mechanism

Pests contain inherited variation; those resistant to the protein may survive exposure and reproduce, passing on relevant alleles. Resistance can therefore become more common across generations. Do not accept that individual pests intentionally change because they need to survive.

S5 / M5 provisional recommendation

Model: continue controlled trials with resistance monitoring before making a wider-use recommendation. The initial reduction in damage is promising, but test matched crop groups over more sites/seasons and monitor pest survival/trait effectiveness. A consistent lack of yield benefit or increasing resistance would weaken the recommendation. Accept a reasoned alternative if it uses supplied evidence and states uncertainty.

M1 distinction

Selective breeding chooses parents with desired inherited traits, then breeds and selects across generations. Genetic engineering directly changes DNA using laboratory technologies. Both can influence inherited characteristics; the method distinguishes them.

M2 mechanism

The added gene provides information for production of a protein in suitable plant cells. That protein affects particular target pests and may reduce damage. The crop remains a plant; not every insect is affected, and the intended trait needs testing.

M4 risk and unknown

Risk: selection can increase inherited pest resistance, reducing future effectiveness. Unknowns: effects across settings, non-target species, food safety, long-term performance or social/economic consequences. Match the claim to what the table actually measures. Do not treat an unanswered question as proof of harm.

T1 two settings

First yield difference Bt−non-GM=+1.0 t/ha; second=−0.1 t/ha. First damage difference=22 fewer plants per100; second=1 fewer. The second setting weakens a blanket benefit claim and suggests context (including pest pressure) matters. It does not prove the first result false or that the crop is always ineffective; means, spread and trial replication matter.

T2 scope and investigation

The trials measure target-pest damage and yield, not composition/toxicity/allergenicity or every ecological interaction. A focused environmental investigation might compare abundance/survival of specified non-target organisms in matched replicated plots over time. A relevant crop-specific safety assessment would need different evidence. Do not infer safety/harm from yield alone.

T3 balanced evaluation

A defensible answer links the initial benefit to reduced target-pest damage, identifies resistance or a relevant possible environmental issue, notes missing repeated/appropriate evidence, and considers growers, consumers or ecosystems. A provisional decision must be conditional, not a universal judgement on the technique.

T4 optional Higher mechanism

Restriction enzyme cuts at a particular recognition sequence; complementary sticky ends can base-pair; ligase seals/joins the DNA backbone; a vector such as a plasmid carries DNA into suitable cells. Successful insertion alone does not guarantee expression, sufficient functional protein or the desired whole-organism effect, so suitable control information/conditions and checks are needed. This detail is optional Higher-tier content, not a Foundation assessment requirement.

Hinge A–D

C is correct. A wrongly says all methods transfer between species. B confuses one useful gene with complete organism identity. D makes an unsupported universal safety/offspring guarantee.

E2–E3 exit

E2 accept lower damage30→8 per100 or greater mean yield6.9→7.9 t/ha, explicitly in the constructed trial. E3 accept resistance with monitoring across pest generations; accept another scientifically plausible specific risk with an appropriate focused test, not a blanket assertion.

L1–L2 reflection and Week4 bridge

Accept a concrete revision prompted by a question, such as naming the crop/trait, correcting a unit or identifying a missing comparison. Good Week4 questions are narrow and answerable, for example “How does this Bt trait affect a named non-target insect in a particular environment?” or “When does lower pest damage lead to a worthwhile yield gain?”

Sources checked for this lesson

Word help

genome
An organism’s complete set of genetic information.
genetic engineering
Using laboratory technologies to directly alter an organism’s DNA.
gene expression
Using genetic information to make a functional product, such as a protein.
GM organism
An organism whose genetic information has been altered using genetic engineering.
Bt
Bacillus thuringiensis, a bacterium from which some pest-control protein genes originate.
provisional conclusion
A conclusion supported now, which can change when new evidence is added.

Cold Call

Give thinking time. Invite a response by voice, pointing or showing work. A pupil can pass; check in privately when useful.

Pause

Take a quiet pause.

You can look away from the screen. Come back when you are ready.

The lesson and your work are still here. Close this box to return.

Lesson tools

Choose a slide or a print route.

Teacher Print Tools

Your typed notes stay here while this page is open. Save them before closing or reloading.