Biology • Year 12 • Module 6 • Lesson 13
Current Genetic Technologies That Induce Genetic Change
Build HSC Band 5–6 extended-response technique on the lesson’s three-category framework, reproductive control, DNA copying, DNA insertion, and whole-organism cloning, by working through two data-rich evaluation tasks.
1. Data + scenario, introducing a new protein trait into livestock (Band 5–6)
8 marks Band 5–6
Scenario. A research team wants to produce cattle that express a human protein with medical value in their milk. They consider three approaches: (A) using artificial insemination with bulls from a selected herd; (B) using gene cloning to produce many copies of the human gene, then using recombinant DNA technology to insert the human gene into cattle embryo cells; (C) using whole-organism cloning of a cow that already expresses the protein. The table below summarises what each approach can and cannot achieve.
| Approach | Technology | Can it introduce a sequence not already in cattle? | Can it copy an organism-level genotype? | Acts mainly at… |
|---|---|---|---|---|
| A | Artificial insemination | No, only reshuffles existing alleles | No | Reproduction (gamete combination) |
| B | Gene cloning + Recombinant DNA | Yes, inserts chosen external DNA directly | No | DNA sequence level in cells |
| C | Whole-organism cloning | Only if the donor already has the sequence | Yes, preserves donor genotype | Cellular and developmental level |
Q1. Analyse and evaluate, using the data and lesson terminology, which combination of technologies would be required to achieve the research team’s goal, and assess why Approach A alone cannot succeed. In your response you must:
- Define genetic technology and place each approach within the lesson’s three-category framework.
- Describe two specific differences shown in the table that support your analysis.
- Explain the role of gene cloning and recombinant DNA technology in Approach B, using lesson terminology.
- Use the lesson’s “what changes, where it acts, why used” framework to justify why Approach B is more appropriate for this goal than Approach A.
- Reach an evidence-based judgement on whether whole-organism cloning (Approach C) could replace Approach B, and why or why not.
2. Data + scenario, evaluate a student claim about cloning (Band 5–6)
8 marks Band 5–6
Scenario. A Year 12 student wrote the following in a practice response: “Whole-organism cloning and gene cloning are essentially the same technology at different scales. Both copy genetic material and both are used to preserve and replicate desirable traits. Therefore they produce the same kind of outcome: a genetically identical copy that reliably reproduces the donor’s characteristics. The main advantage of all cloning technologies is that they give humans more control over genetic outcomes than chance alone.”
Q2. Evaluate this student’s claim. Identify which parts are correct, which are wrong or imprecise, and reformulate the claim as a biologically defensible statement using lesson terminology. In your response you must:
- Define whole-organism cloning and gene cloning using lesson Key Terms.
- Identify what is actually copied in each case, and at what biological level.
- Identify at least two specific errors in the student’s claim and correct each one.
- Acknowledge the one element of the claim that is defensible.
- Reach a judgement that explicitly states the difference in effectiveness between the two technologies, using the lesson’s framework of “effectiveness depends on the goal, not just whether copying occurred.”
Q1, Sample Band 6 response (8 marks), annotated
A genetic technology is any technology used to analyse, manipulate or direct inheritance and genetic change. The lesson places the three approaches in distinct categories: artificial insemination (Approach A) is a reproductive technology it acts at the level of gamete combination in animal reproduction. Gene cloning + recombinant DNA (Approach B) are DNA-level technologies one copies a selected sequence, the other inserts it into cells. Whole-organism cloning (Approach C) acts at the cellular and developmental level it preserves an organism-level genotype. [1, defines genetic technology and places all three correctly in the framework]
Two specific differences from the table support this: (i) Only Approach B can introduce a sequence not already present in cattle, AI can only reshuffle alleles that already exist in the herd’s gene pool. (ii) Only Approach C can copy an organism-level genotype, but it requires the donor to already have the sequence; it cannot create a new sequence from nothing. [1, two specific table differences cited]
In Approach B, gene cloning first produces many identical copies of the human gene sequence using a vector and a host cell. This provides the raw material needed for the next step. Recombinant DNA technology then inserts the human gene directly into cattle embryo cells, allowing it to become part of the cattle genome and be expressed as a protein in milk. These are separate but sequential tools: copying DNA and inserting DNA are different tasks. [1, gene cloning role; 1, recombinant DNA role using lesson terminology]
Using the lesson’s framework, Approach A is insufficient because it acts at the level of reproduction: it controls which alleles combine but cannot introduce DNA from outside the species. The protein the team wants does not exist in any cattle allele pool, so no amount of controlled breeding will produce it. Recombinant DNA technology, which changes DNA sequence directly, is the only approach that can introduce a genuinely new sequence. [1, justification for why A cannot succeed, using “what changes” axis]
Whole-organism cloning (Approach C) could only replace Approach B once a founder animal already carries the inserted gene, it could then be used to multiply that genotype without re-inserting the gene into every new animal. But it could not replace the initial step of introducing the human gene, which requires recombinant DNA technology. The two approaches are therefore complementary, not interchangeable. [1, evidence-based judgement on role of cloning vs recombinant DNA]
Overall, the most direct path to the research team’s goal is Approach B: gene cloning to copy the sequence followed by recombinant DNA technology to insert it. This is more effective for this purpose than AI (which cannot introduce the sequence) and than cloning alone (which cannot generate the sequence if no founder exists). [1, clear overall judgement; 1, consistent use of lesson terminology throughout]
Marking criteria.
- 1 mark Defines genetic technology and correctly places all three approaches in the lesson’s framework.
- 1 mark Cites two specific differences from the table (new sequence introduction; organism-level genotype copying).
- 1 mark Correctly describes the role of gene cloning (copies the sequence using vector + host cell).
- 1 mark Correctly describes the role of recombinant DNA technology (inserts the sequence into cattle cells using a vector).
- 1 mark Justifies why AI cannot succeed, linking to the “what changes” axis (reshuffles existing alleles only, cannot introduce a new sequence).
- 1 mark Reaches a defensible judgement on whole-organism cloning vs recombinant DNA (cloning can multiply but cannot originate the new sequence).
- 1 mark States a clear overall evaluative conclusion naming Approach B as the necessary method.
- 1 mark Uses precise lesson terminology throughout (genetic technology, reproductive technology, DNA-level, induces genetic change, vector, host cell, transgenic organism).
Q2, Sample Band 6 response (8 marks), annotated
Whole-organism cloning is the production of an organism with a genome intended to match that of a donor organism, it acts at the cellular and developmental level. Gene cloning is the production of many identical copies of a selected DNA sequence using a vector and a host cell, it acts at the DNA sequence level. [1, correct definitions using lesson key terms]
What is copied: whole-organism cloning copies an organism-level genotype; gene cloning copies a specific DNA sequence. These are fundamentally different biological levels, and the word “copy” is not sufficient to equate them. [1, identifies what is actually copied in each case and at what level]
Error 1: The claim that both technologies “produce the same kind of outcome.” This is wrong. Gene cloning produces copies of a DNA sequence for use in research, protein production or vector preparation. Whole-organism cloning produces a near-genetically identical organism. These are categorically different outcomes. [1, first specific error identified and corrected]
Error 2: The claim that whole-organism cloning “reliably reproduces the donor’s characteristics.” This is imprecise. Whole-organism cloning aims for similar nuclear genotype, but phenotype is not guaranteed to be identical. The lesson’s distinction (Card 4) is explicit: environment and development also influence phenotype, and cloned animals may differ from their donors in ways that cannot be predicted from genotype alone. [1, second specific error identified and corrected]
What is defensible: The claim that genetic technologies give humans more control over genetic outcomes than chance alone is essentially correct. Both whole-organism cloning and gene cloning do increase deliberate control over which genetic information is preserved or copied. The lesson agrees that increased control is a major advantage. [1, defensible element acknowledged]
Judgement on effectiveness: The lesson frames effectiveness as depending on the goal, not just on whether copying occurred. Gene cloning is often more effective for practical biotechnology goals because its target, producing many copies of a selected sequence, is specific, controllable and scalable. Whole-organism cloning is biologically significant but limited: it can preserve a useful genotype but has low efficiency, developmental difficulties, and no phenotype guarantee. The student’s claim collapses a useful distinction that HSC examiners specifically test. [1, evidence-based effectiveness judgement using lesson framework]
Defensible reformulation: Whole-organism cloning and gene cloning are distinct technologies that operate at different biological levels. Whole-organism cloning copies an organism-level genotype using nuclear transfer and acts at the cellular and developmental level; gene cloning copies a selected DNA sequence using a vector and host cell at the DNA level. They are not interchangeable, their outcomes differ, and their effectiveness should be evaluated by reference to their specific purposes. Both do give humans more control over genetic outcomes compared with chance, but in different ways and with different limitations. [1, defensible reformulation in lesson terminology; 1, consistent use of precise lesson vocabulary throughout]
Marking criteria.
- 1 mark Defines whole-organism cloning and gene cloning correctly using lesson key terms.
- 1 mark Identifies what is copied in each case and at what biological level (organism genotype vs DNA sequence).
- 1 mark Identifies Error 1: the claim that both produce the same outcome (corrected: different outcomes at different levels).
- 1 mark Identifies Error 2: the claim that cloning reliably reproduces characteristics (corrected: phenotype not guaranteed due to development, environment and epigenetics).
- 1 mark Acknowledges the one defensible element (increased control over genetic outcomes compared with chance).
- 1 mark Reaches a judgement on effectiveness using the lesson’s framework (effectiveness depends on goal; gene cloning often more effective for practical biotechnology; whole-organism cloning limited).
- 1 mark Reformulates the claim into a biologically defensible statement using lesson terminology.
- 1 mark Uses precise lesson vocabulary consistently throughout (genetic technology, induce genetic change, DNA-level, organism-level, effectiveness, control, vector, host cell, genotype, phenotype).