Compare all four required roles of mitosis
Four original cases distinguish growth, damaged-tissue repair, routine replacement and eukaryotic asexual reproduction. Their shared contribution is genetically matching daughter-cell production.
Section 17.2 · Mitosis
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 chromosomes, genes, chromosome sets, selective gene expression and the distinction between a nucleus and a whole cell.
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
Which list contains all four syllabus roles?
What you will learn
- Classify growth repair replacement and reproduction
- Retain the shared chromosome mechanism
Original teaching model. Counts and records are stipulated; drawings are schematic.
| Feature | Meaning |
|---|---|
| Growth | Expanding seedling cell population |
| Repair | Supplying suitable cells after damage |
| Replacement | Balancing routine cell loss |
| Asexual reproduction | Building runner offspring from one parent |
Classify growth repair replacement and reproduction
The syllabus specifies four roles for mitosis: growth, repair of damaged tissues, replacement of cells and asexual reproduction. Each uses production of daughter cells with preserved genetic information, but the purpose and context differ. Growth can increase the population of cells; repair responds to damage; routine replacement offsets turnover; eukaryotic asexual reproduction helps build a descendant from one parent.
These categories can overlap in a real organism. A developing replacement cell may grow and specialise, and repairing tissue may temporarily increase its cell population. Classification questions should therefore use the stated context rather than invent mutually exclusive biological compartments. When a question asks for all four roles, naming only growth and reproduction leaves the specified list incomplete.
Retain the shared chromosome mechanism
An original four-case record describes an expanding seedling, a damaged tissue receiving suitable new cells, routine losses balanced by cell production and a runner forming another plant. Match each case with the intended role, then explain the common copying-and-separation mechanism. A role label without the chromosome-maintaining event does not show how mitosis supplies suitable genetic information.
Some changes do not demonstrate any of these mitotic roles. Producing an mRNA molecule from a gene, moving water into a cell and fusing gamete nuclei are different processes. The fact that such processes occur in living cells does not make them mitosis. Explain the event and its context together, and retain the normal accurate-copying assumption when describing genetically identical products.
Pause and explain
Which observation is most directly a different process rather than mitosis?
Worked example
Name the four required roles and their shared contribution.
Show the worked solution
- List all four contexts.
- Connect them with matching daughter-cell production.
Answer Growth, damaged-tissue repair, cell replacement and eukaryotic asexual reproduction use mitotic production of daughter cells with preserved genetic information.
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.
List all four required roles of mitosis.
Give me a hint
Include both damage-related and routine replacement.
Compare my reasoning
- Name growth and damaged-tissue repair.
- Add cell replacement and asexual reproduction.
The four roles are growth, repair of damaged tissues, replacement of cells and asexual reproduction.
Look for these in your work
- Include all four
- Distinguish repair and turnover
Match seedling expansion, damaged-tissue cell supply, balanced routine turnover and runner offspring with their intended roles.
Give me a hint
Use the context in each case.
Compare my reasoning
- Identify the population or organism outcome.
- Match each with the supplied role definition.
Seedling expansion: growth; damaged-tissue supply: repair; balanced turnover: replacement; runner offspring: asexual reproduction.
Look for these in your work
- Match each case
- Retain the stated context
Explain why the role cases share a mitotic mechanism even though their final purposes differ.
Give me a hint
Connect replication, separation and daughter information.
Compare my reasoning
- Copy the chromosome information before division.
- Distribute matching complements to daughter nuclei.
They use prior chromosome copying and separation during mitosis to supply daughter cells with the same genetic information; the later tissue or reproductive purpose differs.
Look for these in your work
- Explain the shared mechanism
- Separate mechanism from purpose
Common mistakes
- The required list contains four roles, not only two.
- A role context does not replace the nuclear-division mechanism.
What can you explain now?
Which observation is most directly a different process rather than mitosis?
Compare with the explanation
Making an mRNA copy from a gene
Gene expression is not nuclear division.
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Make it stick
Without your notes, classify growth repair replacement and reproduction and retain the shared chromosome mechanism. Distinguish nuclear division, chromosome copies and completed daughter cells before opening the solutions.
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.