Discuss sexual reproduction benefits in wild populations
Connect inherited variation with a particular environmental challenge.
Exam scope and assessment notes
Extended only (Supplement) · Biology 0970, 2026–2028. Use the stated specimen features and evidence. Diagrams are schematic. Written practice is self-checked; human subject-teacher review, supervised practical competence and cumulative assessment remain pending. Cambridge states that IGCSE 0970 has the same subject content as IGCSE 0610, with 9–1 grading. This StudyForA pathway maps the 2026–2028 syllabus only. This 9–1 graded qualification is available only in a limited number of administrative zones. Confirm that your centre can enter you for this code and exam series with Cambridge International. Cambridge has published a separate syllabus for 2029. StudyForA has not reconciled that version yet; this page supports exams in 2026, 2027 and 2028 only.
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 links variation with a possible wild-population benefit?
What you will learn
- Explain a population-level benefit
- Keep survival conclusions conditional
Discuss sexual reproduction benefits in wild populations
| Feature | Meaning |
|---|---|
| Variation | Different inherited combinations |
| Challenge | A specified environmental change |
| Possible benefit | Some individuals survive and reproduce |
| Limit | No guarantee for every individual or every stress |
Explain a population-level benefit
Sexual reproduction can produce different inherited combinations among offspring. If a population contains different inherited responses to an environmental change, some individuals may be better suited to the new conditions. This can improve the chance that at least part of the population survives and reproduces. Explain the link between variation, a specific challenge and future reproduction.
For example, a supplied population may contain different inherited tolerances to drought. Under the stated drought, one group survives better than another. The benefit concerns having some suited individuals rather than every member becoming resistant. Reproduction does not deliberately predict a future threat or create whichever trait the population needs on demand.
Keep survival conclusions conditional
Variation is not a guarantee of protection from every disease or habitat change. If none of the inherited combinations is suited to the stress, the population can still decline. Exposure, resources, health and chance also affect individual outcomes. Use conditional wording and the supplied evidence instead of treating diversity as universal immunity.
The relevant comparison is usually with a uniform copied lineage under the same stated conditions, not with every asexual population in nature. Asexual populations can include different clone lineages and mutations. A balanced discussion recognises a possible variation benefit while retaining the reproductive costs and the actual environmental conditions, which the next lesson examines.
Pause and explain
Does a variation benefit mean every individual survives?
Worked example
A supplied diverse population includes a genotype that survives a new dry condition. Explain the possible benefit.
Show the worked solution
- Inherited responses differ.
- Some suited individuals can survive and reproduce.
Answer Variation can leave some individuals suited to the dry condition, supporting population continuation.
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Explain one possible survival advantage of sexually produced genetic variation.
Give me a hint
Connect different responses with a particular change.
Compare my reasoning
- Offspring can have different inherited combinations.
- Some combinations may suit the changed conditions.
Different inherited combinations may leave some individuals suited to a particular environmental change, allowing them to survive and reproduce.
Look for these in your work
- Name variation
- Link it to conditional survival and reproduction
Why does drought tolerance in one supplied genotype not establish protection against every pathogen?
Give me a hint
The evidence is challenge-specific.
Compare my reasoning
- The record concerns drought.
- Pathogen responses are not supplied.
A drought response does not establish resistance to every pathogen; the evidence concerns one particular challenge.
Look for these in your work
- Retain the specified challenge
- Avoid universal protection claims
Discuss the claim that sexual reproduction deliberately creates exactly the traits needed next year.
Give me a hint
Distinguish generated variation from prediction.
Compare my reasoning
- New combinations can arise.
- Future suitability is not deliberately guaranteed.
Sexual reproduction can generate inherited variation, but it does not deliberately predict future conditions or guarantee the required traits.
Look for these in your work
- Give the variation mechanism
- Reject purposeful guaranteed adaptation
Common mistakes
- Saying every offspring becomes adapted deliberately.
- Treating genetic diversity as universal immunity.
What can you explain now?
Does a variation benefit mean every individual survives?
Compare with the explanation
No; population continuation can involve only some survivors
Individual and population outcomes differ.
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Make it stick
Explain a variation benefit through a specific environmental challenge.
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.