Selective breeding, artificial selection and GM crops
Explain how selection improves useful traits, compare selective crop breeding with genetic modification and describe artificial insemination benefits.
Exam scope and assessment notes
Use this original lesson for the listed 2026, 2027–2028 and 2029–2031 Cambridge syllabus cycles. This route maps Cambridge's 2026 Version 2, 2027–2028 Version 1 and 2029–2031 Version 1 syllabuses. The 2026 update changes only a weblink; Cambridge reports no significant teaching changes for the 2027–2028 or 2029–2031 cycles. Exams are in the November series, and the qualification is not available in every administrative zone; confirm entry with your centre. Centre-selected local crop, weed, pest, disease and livestock examples must be checked against local agriculture. StudyForA does not replace supervised, risk-assessed practical work, the four assessed practical exercises, the individual practical investigation/report, teacher assessment or Cambridge moderation. Online practice is not an official mark or grade.
Before you begin
- Read the syllabus that matches your exam year and confirm your centre can enter you for code 0600. This route maps Cambridge's 2026 Version 2, 2027–2028 Version 1 and 2029–2031 Version 1 syllabuses. The 2026 update changes only a weblink; Cambridge reports no significant teaching changes for the 2027–2028 or 2029–2031 cycles. Exams are in the November series, and the qualification is not available in every administrative zone; confirm entry with your centre. Centre-selected local crop, weed, pest, disease and livestock examples must be checked against local agriculture. StudyForA does not replace supervised, risk-assessed practical work, the four assessed practical exercises, the individual practical investigation/report, teacher assessment or Cambridge moderation. Online practice is not an official mark or grade.
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
What is artificial selection?
What you will learn
- Describe selection for yield, disease resistance, hardiness and appearance.
- Explain artificial selection and artificial insemination.
- Distinguish selective breeding from GM crops and evaluate trade-offs.
Select parents for useful traits
Artificial selection is human choice of plants or animals with desired heritable traits as parents for the next generation. Repeated selection may improve yield, disease resistance, hardiness or appearance.
Selection needs reliable records and suitable diversity. Focusing on a narrow trait can reduce genetic diversity or increase unwanted correlated traits; local performance matters.
Compare breeding methods
Selective crop breeding crosses or propagates plants with chosen traits over generations. Genetic modification alters genetic material using biotechnology; it is not the same process as selecting parents for conventional breeding.
Artificial insemination places collected semen into a female reproductive tract by a trained professional. It can allow use of selected males across more females and reduce the need to transport or keep breeding males, but requires skilled management and suitable health controls.
Evaluate outcomes
A new variety or animal line should be judged on measured performance, environment, costs, health, welfare, seed or breeding access and social or regulatory factors.
A trait useful in one location may not perform the same way elsewhere. Breeding goals should be explicit and checked across relevant conditions.
Sources for this lesson
Pause and explain
What is artificial selection?
Worked example
A breeder selects crop plants for high yield from one unusually wet season. Explain why testing across seasons is important.
Show the worked solution
- The high yield may reflect both inherited traits and unusually favourable environmental conditions.
- Trials in different seasons and locations help separate stable genetic performance from environmental effects.
- Also assess disease resistance, quality, input needs, diversity and farmer access.
Answer Selection based on one season may favour plants whose success depended on that environment. Repeated, relevant trials improve confidence but do not guarantee future performance.
Try a topic test
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Write your answer and reasoning first. Use a hint only if you are stuck. The model solution is for self-checking; your written work is not automatically marked.
Explain how artificial selection could improve disease resistance in a crop while identifying a risk of selecting too narrowly.
Give me a hint
Connect observed heritable resistance to choosing parents, then consider diversity.
Compare my reasoning
- Identify plants that show resistance under relevant disease pressure and confirm that the trait can be inherited.
- Use selected plants as parents and evaluate offspring across appropriate conditions.
- Monitor genetic diversity and other traits so selection does not create new weaknesses.
Selection can increase a heritable resistance trait, but narrow selection may reduce diversity or weaken other useful traits.
Look for these in your work
- Trait heritability considered
- Selection sequence explained
- Diversity risk stated
Compare artificial insemination with keeping a breeding male on a small farm, naming one possible benefit and one requirement.
Give me a hint
Consider access to genetics, cost, skill, health and animal welfare.
Compare my reasoning
- Artificial insemination may provide access to selected genetics without keeping or transporting a breeding male.
- It requires trained personnel, correct timing, suitable facilities and health controls.
- Keeping a male has different costs, management and welfare needs; compare local access and veterinary advice.
Artificial insemination can improve access to selected breeding while requiring skilled service and timing. The alternative has its own costs and management demands.
Look for these in your work
- Benefit explained
- Requirement included
- Alternative treated fairly
A GM crop and a conventionally selected variety both show pest resistance. Explain how a farmer should compare them.
Give me a hint
Compare performance, costs, regulation, seed access and evidence rather than labels alone.
Compare my reasoning
- Check local trial performance, stability and pest range.
- Compare seed cost and access, input use, market requirements, regulation and environmental effects.
- Consider resistance management, biodiversity and farmer goals, then decide using locally relevant evidence.
The production method alone does not determine suitability. Compare verified performance, cost, regulation, market and environmental evidence.
Look for these in your work
- Methods distinguished
- Economic and regulatory factors included
- Decision uses evidence
Common mistakes
- Confusing artificial selection with artificial insemination
- Saying GM crops are produced by ordinary cross-pollination
- Assuming a high-yield parent always produces high-yield offspring
- Ignoring genetic diversity and animal welfare
What can you explain now?
What is artificial selection?
Compare with the explanation
Choosing parents with desired heritable traits for future generations
That describes artificial selection.
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Make it stick
Distinguish artificial selection, artificial insemination and genetic modification.
If you needed the solution, close it and solve the problem again from a blank page. A correct answer is stronger when you can explain the reason for each step.