21.Biotechnology & Genetic Modification(Part 2)(2/2)(Cambridge IGCSE Biology 0610 for 2026,'27,'28)

Genetic Modification Process (Insulin Example)
📌 Genetic modification involves changing the DNA of living things by removing, changing, or inserting individual genes to achieve specific traits.
✂️ The human gene for insulin is isolated and cut from its original DNA using restriction enzymes, which act like molecular scissors creating fragments with "sticky ends."
🧬 The cut bacterial plasmid DNA is then joined with the human gene piece using DNA ligase, which functions as molecular glue, forming a recombinant plasmid.
🧪 The recombinant plasmid is inserted into bacteria, allowing them to multiply and express the human gene to produce the desired protein, like human insulin.

Applications of Genetic Modification
🏥 Human genes are inserted into bacteria to produce therapeutic human proteins, such as insulin, for medical use.
🌱 Crop plants can be modified to possess herbicide resistance, enabling better weed control without harming the crop.
🐛 Genes can be added to crops to impart insect pest resistance, reducing the need for excessive chemical pesticides.
🍎 Genetic modification can be used to improve nutritional qualities in crops by boosting levels of essential vitamins and minerals.

Advantages and Disadvantages of Genetically Modified Crops
⬆️ Advantages include improved yield, leading to more food production, and the creation of healthier food with enhanced nutritional content (e.g., added vitamins).
🌍 Genetically modified (GM) crops can be better for Earth as herbicide/pesticide resistance may necessitate fewer harmful chemical applications.
📉 Disadvantages involve the loss of biodiversity if too many GM crops are used exclusively, reducing plant variety.
🔁 There is a risk of gene mixing where GM traits cross-breed with wild relatives, potentially causing issues like herbicide resistance spreading to weeds.

Key Points & Insights
➡️ Genetic modification is defined as altering genetic material by inserting, removing, or changing individual genes.
➡️ Key enzymes in this process are restriction enzymes (for cutting DNA) and DNA ligase (for joining DNA fragments).
➡️ A major advantage of GM crops is the potential for increased yield and reduced chemical usage, which benefits both food security and the environment.
➡️ Potential drawbacks include reduced biodiversity and the risk of modified genes spreading to wild populations.

📸 Video summarized with SummaryTube.com on Feb 02, 2026, 05:08 UTC