Class 12 Biology - ANDHRA-PRADESH
Biotechnology and its Applications
The chapter 'Biotechnology and its Applications' explores how genetic engineering and recombinant DNA technology are used for human welfare. Students will learn about the creation of genetically modified organisms (GMOs) in agriculture, such as Bt cotton and pest-resistant plants, and their role in increasing crop yield. It also covers medical applications including the production of recombinant insulin, gene therapy, and molecular diagnostics like PCR and ELISA. Finally, the chapter highlights ethical issues, biopiracy, and the ethical, legal, and social implications (ELSI) associated with the commercial use of biological resources, making it a high-scoring and conceptually vital chapter for board exams.
Start Learning FreeKey Concepts
Bt Cotton
A genetically modified pest-resistant cotton variety that expresses a toxic protein gene from the bacterium Bacillus thuringiensis to kill bollworms.
RNA Interference (RNAi)
A cellular defense mechanism used in eukaryotic organisms to silence specific genes, applied in agriculture to protect tobacco plants from nematode infection.
Genetically Engineered Insulin
Human insulin produced using recombinant DNA technology in E. coli by separately inserting genes for chains A and B, then combining them.
Gene Therapy
A treatment method that corrects genetic disorders, such as ADA deficiency, by introducing a healthy functioning gene into the patient's cells.
Molecular Diagnostics
Early disease detection techniques like PCR, ELISA, and recombinant DNA probes that identify pathogens or mutations before symptoms appear.
Biopiracy
The unauthorized extraction and commercial exploitation of biological resources and traditional knowledge of indigenous communities without proper compensation.
Important Formulas
Board Exam Info
In the Andhra Pradesh (BSEAP) Class 12 Biology board examinations, this chapter typically carries around 6 to 8 marks. Questions frequently include 2-mark short answers (e.g., definitions of RNAi or biopiracy), 4-mark explainers (e.g., process of producing recombinant insulin or application of Bt cotton), and occasionally form parts of long-answer questions combining principles and applications.
Frequently Asked Questions
Why is the Bt toxin not toxic to the Bacillus thuringiensis bacterium itself?
The Bt toxin is produced as an inactive protoxin inside the bacterium. It only becomes active when exposed to the alkaline pH of an insect's gut.
What is the main difference between gene therapy and conventional medicine?
Conventional medicine treats the symptoms of a disease, whereas gene therapy corrects the root cause by replacing or repairing the defective gene at the molecular level.
What are transgenic animals and why are they created?
Transgenic animals have had their DNA manipulated to possess foreign genes. They are created to study disease mechanisms, test vaccine safety, study gene regulation, and produce biological products like human proteins.
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