Identify budding from a parent and outgrowth
Compare budding yeast or hydra with equal splitting.
Section 16.1 · Asexual reproduction
Exam scope and assessment notes
Core and Extended · 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 cells, DNA, inherited characteristics and the distinction between growth of an organism and production of offspring.
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
Which observation best supports budding?
What you will learn
- Recognise a growing attached bud
- Use a sequence rather than shape alone
Identify budding from a parent and outgrowth
| Feature | Meaning |
|---|---|
| Origin | Outgrowth from one parent |
| Developing structure | Bud initially smaller in the supplied model |
| Counting | Retained parent plus detached buds |
| Evidence limit | Two touching cells alone do not prove budding |
Recognise a growing attached bud
Budding begins as an outgrowth from one parent cell or organism. In a supplied yeast sequence, a small bud enlarges, receives copied genetic information and can separate as a daughter cell. In a supplied hydra sequence, a smaller outgrowth develops body structures and eventually separates as a new individual. These are different organisms showing a one-parent asexual pattern.
A bud is often smaller than the parent during development. That unequal size contrasts with the approximately equal daughters in the simple binary-fission diagram, but size alone is not a universal test. A single image of two touching cells can be ambiguous. The sequence or caption should establish that the smaller structure grows from the parent rather than being an unrelated neighbouring organism.
Use a sequence rather than shape alone
In the stated budding yeast model, the parent can remain while producing a bud. After one bud separates, count a parent and a daughter, rather than automatically treating the parent as lost as in the simple fission record. Not all yeast species have identical life cycles, and yeast can have other reproductive modes; identify the budding event supplied rather than calling every event in a fungus asexual.
The clone relationship comes from the one-parent copying history in the model, not from a visible round outline alone. A photograph may support identification of a bud but cannot directly reveal the whole genotype. Combine structural observations with the supplied reproductive information, and keep the distinction between a developing bud, a separated daughter and the continuing parent clear.
Pause and explain
Can a supplied hydra outgrowth be an asexual offspring?
Worked example
A yeast parent remains while one attached bud enlarges and detaches. Name the process and the final cell count.
Show the worked solution
- The outgrowth develops from one parent.
- After detachment, the parent and one daughter are separate.
Answer Budding; two separate cells in the supplied one-bud record.
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.
Name the process when a small attached outgrowth develops into a new individual from one parent.
Give me a hint
Use the outgrowth pattern.
Compare my reasoning
- A bud grows from the parent.
- It develops into an offspring.
Budding, an example of asexual reproduction in the supplied copying model.
Look for these in your work
- Identify budding
- Link one parent with offspring
A stated yeast parent produces two buds that both detach, while the parent remains. How many separate cells are then present?
Give me a hint
Count the retained parent and both daughters.
Compare my reasoning
- The continuing parent counts as one.
- Two detached daughters add two.
Three separate cells: the retained parent and two daughters.
Look for these in your work
- Retain the stated parent
- Count both detached daughters
A micrograph shows two touching cells with no caption or time sequence. Is budding proved?
Give me a hint
Touching is not the same evidence as outgrowth.
Compare my reasoning
- The reproductive origin is not established by proximity.
- A bud connection or sequence would strengthen identification.
No. Touching cells alone do not prove budding; evidence of a developing outgrowth and its reproductive history is needed.
Look for these in your work
- State the evidence limit
- Name a stronger observation
Common mistakes
- Assuming any touching cells must be budding.
- Removing the continuing yeast parent from the stated count.
What can you explain now?
Can a supplied hydra outgrowth be an asexual offspring?
Compare with the explanation
Yes, when it develops from one parent without gamete fusion
The supplied reproductive history supports budding.
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Make it stick
Describe budding and explain how its supplied parent-retention count differs from the bacterial fission count.
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.