Biology • Year 12 • Module 6 • Lesson 14
Reproductive Technologies — Artificial Insemination & Artificial Pollination
Lock in the vocabulary, the animal-vs-plant comparison, and the syllabus distinction: these technologies control which gametes combine, not the DNA sequence inside the genes.
1. Term–definition match
The ten definitions below are shuffled. In the right-hand column write the matching term from this list: artificial insemination, artificial pollination, controlled breeding, trait control, fertilisation outcome, productivity, selected male, donor pollen, stigma, semen. 10 marks
| # | Definition (shuffled) | Matching term |
|---|---|---|
| 1.1 | The deliberate introduction of semen into the female reproductive tract without natural mating. | |
| 1.2 | The deliberate transfer of chosen pollen to a stigma to control plant fertilisation. | |
| 1.3 | Managing which parent organisms contribute gametes to the next generation. | |
| 1.4 | Increasing the likelihood that selected inherited characteristics appear in offspring. | |
| 1.5 | The genetic combination produced after selected gametes combine in fertilisation. | |
| 1.6 | Efficiency or output gain, often important in agricultural contexts. | |
| 1.7 | A male animal chosen by the breeder as the source of sperm for an AI program (e.g. a high-yielding dairy bull). | |
| 1.8 | Pollen collected from a chosen flower and intentionally placed on the recipient flower's stigma. | |
| 1.9 | The female part of a flower that receives pollen during pollination. | |
| 1.10 | The fluid containing sperm collected from a selected male for use in artificial insemination. |
2. True or false — with correction
For each statement, circle T or F. If the statement is false, write the corrected version on the line provided. 10 marks (1 for T/F, 1 for the correction where needed)
2.1 Artificial insemination directly rewrites the DNA sequence of the offspring. T / F
2.2 Both artificial insemination and artificial pollination control which parents contribute gametes. T / F
2.3 Artificial pollination guarantees that every seed produced will be genetically identical. T / F
2.4 Artificial insemination prevents meiosis from occurring in the selected male. T / F
2.5 Artificial pollination usually involves transferring chosen pollen to the stigma of a selected recipient flower while excluding unwanted pollen. T / F
3. Order the process steps
The six steps below are shuffled. Place each step number into the correct ordered box, three for artificial insemination and three for artificial pollination. 6 marks (½ per correct slot)
Shuffled steps
- Pollen is transferred to the stigma of the selected recipient flower while unwanted pollen is excluded.
- Semen is collected from a selected male.
- Pollen is collected from a chosen donor plant.
- Semen may be tested, diluted or stored before use.
- A chosen parent plant is identified as the recipient.
- Semen is introduced into the female reproductive tract at the appropriate time in the reproductive cycle.
| Order | Artificial insemination (animal) | Artificial pollination (plant) |
|---|---|---|
| Step 1 | ||
| Step 2 | ||
| Step 3 |
4. Compare process and outcome — fill the table
Complete each cell with a brief, precise statement using lesson terminology. 10 marks (1 per cell)
| Feature | Artificial insemination | Artificial pollination |
|---|---|---|
| Biological system | ||
| Gamete moved by the breeder | ||
| Site of fertilisation | ||
| Intended outcome | ||
| Typical agricultural use |
5. Function recall
Answer each in 1–2 sentences using precise terms from the lesson. 8 marks (2 each)
5.1 What is the function of artificial insemination in a commercial dairy herd?
5.2 What is the function of excluding unwanted pollen during artificial pollination?
5.3 What is the function of storing semen (e.g. by freezing) between collection and use?
5.4 What is the function of controlled breeding for the inheritance of desirable traits?
6. Build a concept map
Draw labelled arrows between the five terms below to show how they connect. Each arrow must carry a linking phrase (e.g. "controls", "selects", "increases the probability of"). Aim for at least 5 labelled arrows. 6 marks
Supplied terms: artificial insemination · artificial pollination · controlled breeding · trait control · agricultural productivity.
Q1 — Term–definition matches
1.1 artificial insemination • 1.2 artificial pollination • 1.3 controlled breeding • 1.4 trait control • 1.5 fertilisation outcome • 1.6 productivity • 1.7 selected male • 1.8 donor pollen • 1.9 stigma • 1.10 semen.
Marking: 1 mark per correct match.
Q2 — True / false with correction
2.1 False. Correction: artificial insemination does not rewrite DNA sequence — it controls which sperm is introduced into the female reproductive tract for fertilisation.
2.2 True.
2.3 False. Correction: artificial pollination uses controlled pollen to make selected trait combinations more likely, but offspring are still produced by ordinary fertilisation, so seeds are genetically varied (not identical).
2.4 False. Correction: meiosis still occurs normally in the selected male — AI only changes how the resulting sperm is delivered to the female, not how it is produced.
2.5 True.
Marking: 1 mark for the correct T/F. 1 mark for an accurate correction in 2.1, 2.3 and 2.4. Maximum 10.
Q3 — Ordered process steps
Artificial insemination: Step 1 — collect semen from a selected male (shuffled #2). Step 2 — test, dilute or store the semen (shuffled #4). Step 3 — introduce semen into the female reproductive tract at the appropriate time (shuffled #6).
Artificial pollination: Step 1 — identify a chosen parent (recipient) plant (shuffled #5). Step 2 — collect pollen from a chosen donor plant (shuffled #3). Step 3 — transfer pollen to the stigma of the recipient while excluding unwanted pollen (shuffled #1).
Marking: 1 mark per correctly placed step (6 max).
Q4 — Compare process and outcome
Biological system: AI — animal (mammal) reproductive system. AP — flowering plant reproductive system.
Gamete moved by the breeder: AI — sperm (in semen). AP — pollen (carrying male gametes).
Site of fertilisation: AI — inside the female reproductive tract of the selected female. AP — inside the ovule of the recipient flower after pollen reaches the stigma.
Intended outcome: AI — fertilisation by sperm from a selected male, increasing control over inherited trait combinations. AP — fertilisation by chosen pollen, allowing planned crosses with more predictable inheritance.
Typical agricultural use: AI — livestock breeding (e.g. dairy cattle for milk yield, beef cattle for growth rate, sheep). AP — crop breeding (e.g. wheat, apple, tomato hybrids; combining yield with pest or disease resistance).
Marking: 1 mark per cell (10 max). Accept any biologically correct equivalent.
Q5.1 — Function of AI in a dairy herd
AI lets a herd use sperm from a small number of high-genetic-merit bulls (e.g. high estimated breeding value for milk yield) without transporting them, so the desirable male's genes are spread quickly through many cows and inherited trait combinations linked to productivity become more likely in the calf generation.
Q5.2 — Function of excluding unwanted pollen
It prevents random pollen from other flowers fertilising the recipient's ovules, so only the breeder's chosen pollen contributes a male gamete. This protects the planned cross and keeps the offspring's parentage controlled.
Q5.3 — Function of storing semen
Stored (often frozen) semen lets a selected male be used long after collection and in many locations, so a single high-merit male's genes can be spread across herds, seasons and even after the male's death — increasing the reach of controlled breeding.
Q5.4 — Function of controlled breeding for desirable traits
By choosing both parents, controlled breeding increases the probability that desirable alleles (e.g. for milk yield, fruit size, disease resistance) are inherited together in the offspring, lifting agricultural productivity. It does not guarantee outcomes because meiosis and fertilisation still introduce variation.
Q6 — Sample concept map
A correct map should include arrows such as:
- artificial insemination — is a type of → controlled breeding
- artificial pollination — is a type of → controlled breeding
- controlled breeding — increases the probability of → trait control
- trait control — raises → agricultural productivity
- artificial insemination — directly supports → agricultural productivity (livestock systems)
- artificial pollination — directly supports → agricultural productivity (crop systems)
Marking: 6 marks for at least five biologically valid, correctly directed arrows with linking phrases that respect the causal chain. Accept any valid linking phrasing.