Class 12 Biology - ISC
Biotechnology and its Applications
The chapter 'Biotechnology and its Applications' explores how genetic engineering and molecular biology are applied to improve human welfare. For Class 12 ISC students, this chapter is crucial as it bridges theoretical DNA technology with practical uses in medicine and agriculture. You will learn about genetically modified organisms (GMOs), biopesticides, gene therapy, molecular diagnostics like PCR and ELISA, and the ethical issues surrounding transgenic research. Board exams heavily test application-based questions from this chapter, particularly regarding Bt cotton, recombinant insulin production, and RNA interference.
Start Learning FreeKey Concepts
Bt Cotton
A genetically modified crop containing genes from the bacterium Bacillus thuringiensis that produce crystal proteins toxic to specific insect pests like bollworms.
RNA Interference (RNAi)
A cellular defense mechanism in eukaryotes that uses double-stranded RNA to silence specific messenger RNAs, used to protect plants like tobacco from nematode infestations.
Genetically Engineered Insulin
Human insulin (Humulin) produced using recombinant DNA technology in E. coli by separately cloning chains A and B and linking them via disulfide bonds.
Gene Therapy
An experimental technique to correct defective genes responsible for hereditary diseases, famously applied to treat ADA deficiency using retroviral vectors.
Molecular Diagnostics
Early detection methods for diseases using technologies like PCR and ELISA, which detect pathogens or mutated genes even when their concentration is very low.
Biopiracy and Biopatents
The unauthorized extraction of biological resources and traditional knowledge from indigenous communities, and the legal protection issues surrounding them.
Important Formulas
Board Exam Info
In the ISC Class 12 Biology examination, this chapter typically carries around 4 to 6 marks. Questions frequently appear as short-answer applications (e.g., explaining the mode of action of Bt cotton or RNAi) and reasoning-based questions regarding ethical issues and biopiracy.
Frequently Asked Questions
Why doesn't the Bt toxin kill the bacterium Bacillus thuringiensis itself?
The toxin exists inside the bacterium as an inactive protein known as protoxin, which only becomes active in the alkaline pH of an insect's gut.
What is the difference between gene therapy for ADA deficiency and transgenic animals?
Gene therapy treats somatic cells of an individual patient to cure a genetic disorder, whereas transgenic animals have foreign DNA stably integrated into their germline, passing it to offspring.
How does ELISA work as a diagnostic tool?
ELISA is based on the principle of antigen-antibody interaction, where the presence of an infection is detected by observing an enzyme-mediated color change.
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