Investigate the uses and applications of biotechnology (past, present and future), including: analysing the social implications and ethical uses of biotechnology, including plant and animal examples; researching and evaluating the development and use of a biotechnology

What this dot point is asking

NESA wants you to know specific named biotechnologies, what they do, and how to evaluate their social and ethical implications. Use one detailed example per category (agriculture, medicine, industry) rather than a long superficial list.

The answer

Biotechnology is the use of living organisms or their components to make products or processes for human use. Modern biotechnology relies on recombinant DNA, fermentation and increasingly on genome editing.

Agricultural biotechnology

Bt cotton (transgenic insect resistance). The cry1Ac gene from Bacillus thuringiensis is inserted into cotton, where it expresses a Cry protein lethal to bollworm larvae. Reduces pesticide spraying, increases yield, and now accounts for the majority of cotton grown in India, China, the United States and Australia.

Golden rice (transgenic nutritional enhancement). Rice engineered to express beta-carotene (vitamin A precursor) using genes from maize and a soil bacterium. Aims to reduce vitamin A deficiency in populations dependent on rice. Approved in the Philippines in 2021. Critics argue dietary diversification would address the deficiency without GM crops; supporters point out diversification has failed for decades in the affected regions.

Herbicide-tolerant crops. Soybean, canola and corn engineered with bacterial EPSPS gene confer resistance to glyphosate, allowing farmers to spray over a growing crop. Increases yields and reduces tillage, but selects for glyphosate-resistant weeds and concentrates farm income towards seed and chemical companies.

Medical biotechnology

Recombinant human insulin (Humulin, 1982). The first commercial recombinant drug. Human insulin gene is inserted into E. coli using a plasmid vector; bacteria express and secrete insulin, which is purified for clinical use. Replaced porcine and bovine insulin and removed allergic complications.

Recombinant vaccines. Hepatitis B and HPV vaccines use yeast-expressed viral surface proteins rather than live or attenuated virus, removing infection risk during manufacture.

Gene therapy. Inserting a functional copy of a gene into a patient's cells to correct a genetic disease. Examples: Luxturna (RPE65 for inherited blindness, approved 2017), Zolgensma (SMN1 for spinal muscular atrophy, approved 2019).

Monoclonal antibodies. Engineered antibodies (e.g. trastuzumab for HER2-positive breast cancer) target specific cell-surface markers with minimal off-target effects.

Industrial biotechnology

Recombinant chymosin (rennet). Calf rennet historically extracted from slaughtered calves' stomachs is now produced in genetically modified Aspergillus or yeast, supplying the cheese industry without animal slaughter and at lower cost.

Biofuels. Engineered microbes ferment plant biomass into ethanol or biodiesel as renewable transport fuel.

Bioremediation. Bacteria such as Pseudomonas putida engineered to metabolise oil hydrocarbons or heavy metals at contaminated sites.

Forensic and reproductive biotechnology

DNA profiling. Short tandem repeat (STR) analysis identifies individuals from a blood, saliva or tissue sample. Used in criminal forensics, paternity testing and identification of disaster victims.

Reproductive cloning. Somatic cell nuclear transfer (Dolly the sheep, 1996) and embryo splitting are used in livestock breeding for high-value animals (champion racehorses, prize bulls). Banned for human reproduction in most jurisdictions.

Social and ethical considerations

Benefits. Higher yields, fewer pesticides, cheaper medicines, replacement of animal-derived products, treatments for previously untreatable diseases.

Concerns.

1. Intellectual property. Patents on seeds and gene therapies concentrate control with a few corporations and raise prices.
2. Access equity. Million-dollar gene therapies are out of reach for most patients globally.
3. Environmental. Gene flow to wild relatives, resistance evolution in target pests, non-target ecological effects.
4. Religious and cultural. Some communities oppose transgenic organisms on religious or "playing God" grounds.
5. Animal welfare. Cloned and transgenic livestock face higher rates of developmental abnormalities.
6. Consent and dual use. Germline gene editing raises consent issues for future generations; gene drives could intentionally drive species extinct.

Summary table

Worked example

You are asked to evaluate golden rice.

Mechanism. Three transgenes (two from maize, one from a soil bacterium) drive beta-carotene synthesis in rice endosperm. The grain turns yellow.

Benefit. Vitamin A deficiency causes preventable blindness and immune deficiency in roughly 250 million children globally. A single bowl of golden rice can supply 50 percent of a child's daily vitamin A requirement.

Concerns. Dietary diversification (leafy vegetables, eggs) would also address the deficiency; opponents argue that GM solutions distract from underlying poverty. Approval was delayed by more than 20 years partly because of activist opposition.

Judgement. Approval in the Philippines in 2021 shows the technology is now considered safe by regulators in the most affected region. Combined with diversification efforts, golden rice is likely to reduce vitamin A deficiency where it is adopted, although it is not a sole solution.

Common traps

Listing without depth. A long unspecific list scores poorly. One named example with the mechanism and a quantified outcome beats six superficial mentions.

Ignoring the social side in an "evaluate" question. Evaluate questions require both benefits and limitations; missing one side caps the mark.

Confusing recombinant DNA with selective breeding. Selective breeding works within species and uses sexual reproduction; recombinant DNA can transfer genes between any organisms.

Treating "biotechnology" as only GM crops. The category also includes recombinant medicines, industrial enzymes, forensics, vaccines and cloning.

In one sentence

Biotechnology applies recombinant DNA, fermentation and genome editing to agriculture (Bt cotton, golden rice), medicine (recombinant insulin, gene therapy), industry (chymosin, biofuels) and forensics (STR profiling), with benefits in yield, health and sustainability that are tempered by ethical concerns over patents, access, environmental release and animal welfare.