Class 12 Biology - CBSE
Biotechnology and its Applications
The chapter 'Biotechnology and its Applications' explores how genetic engineering principles are utilized to solve real-world problems in agriculture, medicine, and industry. Class 12 CBSE students learn about genetically modified organisms like Bt cotton, RNA interference, the creation of recombinant therapeutics such as human insulin, gene therapy, and molecular diagnostics. Ethical issues surrounding the use of genetically modified organisms and biopiracy are also discussed. This chapter is highly scoring and carries significant weight in the CBSE board exams, frequently appearing in the form of direct application-based questions, conceptual queries, and case studies.
Start Learning FreeKey Concepts
Bt Cotton
A genetically modified crop containing genes from the bacterium Bacillus thuringiensis (cry genes), which produce crystal proteins that act as bio-pesticides against bollworms.
RNA Interference (RNAi)
A cellular defense mechanism in eukaryotes that uses double-stranded RNA to silence specific messenger RNAs, successfully applied to protect tobacco plants from nematode infection.
Genetically Engineered Insulin (Humulin)
Recombinant insulin produced by inserting human insulin A and B chains into E. coli plasmids, overcoming the limitations of animal-derived insulin.
Gene Therapy
A technique to correct defective genes responsible for hereditary diseases, famously illustrated by the treatment of ADA deficiency using retroviral vectors.
Biopiracy and Biopatents
The unauthorized exploitation of bio-resources and traditional knowledge by multinational companies without proper compensation to the indigenous people or nations.
Important Formulas
Board Exam Info
This chapter typically carries around 4 to 6 marks in the CBSE Class 12 Biology board examination. Questions often test practical applications, such as the mechanism of Bt toxin activation in insect guts, steps of producing recombinant insulin, or differentiating between biopiracy and biopatents.
Frequently Asked Questions
Why doesn't the Bt toxin kill the Bacillus thuringiensis bacterium itself?
The toxin exists in the bacterium as an inactive protoxin. It only becomes active and lethal when it encounters the alkaline pH of the insect's midgut, which solubilizes the crystals.
What is the difference between gene therapy for ADA deficiency and regular medication?
Gene therapy aims to permanently introduce a functional ADA gene into the patient's cells (like lymphocytes or bone marrow cells) so they can produce their own enzyme, whereas enzyme replacement therapy is temporary and requires repeated injections.
What are GEAC and what is its role?
GEAC stands for Genetic Engineering Appraisal Committee. It is an Indian government setup that makes decisions regarding the validity of GM research and the safety of introducing GM organisms for public services.
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