Weigh sexual reproduction in wild and crop contexts
Give a linked advantage, cost and conditional judgment in both settings.
Exam scope and assessment notes
Mapped to the named 0973 section using teaching from the corresponding single-science course. A 0973-specific review of every Core and Supplement objective is still in progress. Written practice is self-checked; it does not demonstrate supervised laboratory competence or award an official Cambridge grade. This qualification reports two grades on the 9–1 scale; confirm the entry route for your zone and exam series.
Before you begin
- Recall DNA, inherited characteristics, nuclei and the distinction between growth and reproduction.
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
What makes a balanced discussion useful?
What you will learn
- Build a discussion around each goal
- Use evidence instead of an absolute ranking
Weigh sexual reproduction in wild and crop contexts
| Feature | Meaning |
|---|---|
| Wild benefit | Some variation may suit a specified change |
| Wild cost | Compatible contributors and resource investment |
| Crop benefit | New combinations for evaluation and selection |
| Crop cost | Exact selected genotype may not be preserved uniformly |
Build a discussion around each goal
A discussion should explain mechanisms and consequences rather than list unconnected words. In a wild population, inherited variation can leave some individuals suited to a particular change. For a route needing different adults, mate scarcity and reproductive investment can limit multiplication. Link each point to a specified habitat and reproductive condition before judging the balance.
For crop production, new inherited combinations can help a grower discover and select useful trait combinations. The same variation can be a disadvantage when the goal is exact preservation of one selected donor genotype or a predictable inherited crop type. Relevant pollen transfer, fertilisation, development time and resource costs also matter. These goals explain why the same variation can have different practical value.
Use evidence instead of an absolute ranking
A numerical record needs a measured outcome and denominator. More established seedlings do not by themselves establish higher adult yield, disease freedom, desired genotype or practical skill. A survivor model illustrates inherited-response differences only under its stated stress. Use these examples as conditional evidence, not as a certificate that one reproductive mode always wins.
A strong conclusion answers the actual goal: a cross-fertilising wild population facing a new stress may benefit from variation but still need compatible contributors; a breeder seeking new combinations may favour crossing while a grower preserving a chosen genotype may favour copying. Keep these contrasts conditional and acknowledge that meiosis is taught in its own pathway
Sources for this lesson
Pause and explain
Does the required discussion cover both settings?
Worked example
A grower wants a new trait combination, while a second wants to preserve one chosen genotype. Give a conditional comparison.
Show the worked solution
- The first goal can use variation for selection.
- The second goal values faithful genotype retention.
Answer Crossing can support the first goal; vegetative copying can support the second in its stated model.
Try a topic test
Choose Easy, Normal or Difficult. Save your answers and open worked review after finishing.
Test this topic →From guided practice to a new situation
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.
Give one explained sexual-reproduction advantage and disadvantage for a wild cross-fertilising population.
Give me a hint
Link variation and mate availability to consequences.
Compare my reasoning
- Variation may leave some suited to a particular change.
- Compatible contributors can be scarce.
Inherited variation may help some individuals survive a particular change, but compatible-mate scarcity can limit reproduction in a cross-fertilising population.
Look for these in your work
- Explain a benefit
- Explain a route-specific cost
Give one explained benefit and cost for crop production.
Give me a hint
Use breeding and donor-preservation goals.
Compare my reasoning
- New combinations provide candidates for selection.
- Desired donor genotypes may not be uniformly retained.
Crossing can provide new trait combinations for breeding, but may not preserve an exact selected donor genotype uniformly among offspring.
Look for these in your work
- Explain the breeding benefit
- Link the cost to preservation
Give a conditional conclusion using both contexts and explain why a high seed-establishment percentage does not settle every goal.
Give me a hint
Separate ecological and production goals from the measured nursery outcome.
Compare my reasoning
- Wild survival depends on useful responses and reproductive conditions.
- Crop choices depend on breeding or preservation goals; establishment is one outcome.
The balance depends on stress, compatible contributors and the crop goal. Seed establishment measures one nursery outcome and cannot establish every desired genotype, adult yield or a universally best reproductive route.
Look for these in your work
- Address both contexts
- Retain evidence limits
Common mistakes
- Discussing only the wild or only crops.
- Giving a universal winner without a goal or conditions.
What can you explain now?
Does the required discussion cover both settings?
Compare with the explanation
Yes; wild populations and crop production
Both are named in the syllabus requirement.
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Make it stick
Give a balanced discussion for both contexts and a conditional conclusion.
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.