Explain mitosis in eukaryotic asexual reproduction
Mitosis builds cells during eukaryotic asexual reproduction such as runner development. Bacterial fission is asexual but lacks nuclear mitosis; fertilisation is a separate event.
Section B16.2 · Cell division
Mapped to the named 0654 section using teaching from the corresponding single-science course. A 0654-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.
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 example connects mitosis with asexual reproduction in a eukaryote?
What you will learn
- Connect one-parent reproduction with mitosis
- Distinguish bacterial fission and fertilisation
Original teaching model. Counts and records are stipulated; drawings are schematic.
| Feature | Meaning |
|---|---|
| Runner development | One parent; mitotic production of plant cells |
| Whole offspring | Many divisions plus growth and specialisation |
| Bacterial fission | Asexual, but no nucleus and no mitosis |
| Fertilisation | Fusion of gamete nuclei, not mitosis |
Connect one-parent reproduction with mitosis
Mitosis has a role in asexual reproduction in eukaryotic organisms. In a plant runner, for example, dividing cells help form a new plant using genetic information from one parent. With accurate copying and no genetic change, the descendants retain the parent's genetic information. No fusion of male and female gamete nuclei is required for that reproductive route.
The cell-division event and the organism's reproductive outcome are different levels. One mitotic division produces daughter nuclei, usually followed by daughter cells. Building a new multicellular plant normally involves many divisions and later growth and specialisation. It is not correct to claim that every mitotic event instantly produces a complete new organism.
Distinguish bacterial fission and fertilisation
Asexual reproduction is wider than mitosis. Bacteria have no nucleus, so bacterial binary fission is not mitosis. This boundary preserves the earlier asexual-reproduction pathway: a process can be asexual without being nuclear division. Likewise, sexual fertilisation fuses gamete nuclei and is not the mitotic mechanism, although later growth of the zygote uses mitotic divisions.
One-parent genetic copying does not guarantee identical health or visible growth under all conditions. Descendants may experience different environments, and mutation can change the normal genetic-copying outcome. The useful comparison is the reproductive source of information and the mechanism of cell production, not a promise that cloned plants will all perform identically.
Sources for this lesson
Pause and explain
Does every mitotic division produce a whole new multicellular organism?
Worked example
Why can runner growth involve mitosis while bacterial fission is not mitosis?
Show the worked solution
- Identify plant nuclei.
- Identify the absence of a bacterial nucleus.
Answer Runner cells divide their nuclei; bacterial fission is asexual cell division without nuclear mitosis.
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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 mitosis in one-parent runner reproduction.
Give me a hint
Connect copied information and new plant cells.
Compare my reasoning
- Identify one parental source of genetic information.
- Explain nuclear and cell division building the offspring.
Mitotic division of the runner cells supplies genetically matching daughter cells that grow and specialise into the new plant, without gamete-nucleus fusion.
Look for these in your work
- Identify one parent
- Connect mitosis with development
Compare bacterial binary fission with runner development: both are asexual, but which uses mitosis?
Give me a hint
Ask whether there is a nucleus.
Compare my reasoning
- Identify nuclei in the plant cells.
- Recognise that bacterial cells lack a nucleus.
Runner development uses mitosis in its eukaryotic cells; bacterial binary fission is asexual division but is not mitosis.
Look for these in your work
- Classify both as asexual
- Distinguish the nuclear mechanism
Two genetically matching runner plants grow differently in different conditions. Does that alone disprove their one-parent origin?
Give me a hint
Separate inherited information from environment.
Compare my reasoning
- Identify the shared genetic record.
- Allow different environmental effects on growth.
No. Different conditions can cause different growth without disproving the supplied shared genetic information and one-parent origin.
Look for these in your work
- Use the supplied record
- Avoid equating growth with genetic identity
Common mistakes
- Asexual reproduction does not always mean mitosis.
- A mitotic cell event is not always a whole new organism.
What can you explain now?
Does every mitotic division produce a whole new multicellular organism?
Compare with the explanation
No; many divisions and development may be needed
Cell and organism outcomes are different levels.
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Make it stick
Without your notes, connect one-parent reproduction with mitosis and distinguish bacterial fission and fertilisation. 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.