Class 12 Biology - KARNATAKA
Biotechnology and its Applications
The chapter 'Biotechnology and its Applications' explores how biological organisms, cells, and enzymes are utilized in various sectors to produce useful products and services for human welfare. Key topics covered in the Karnataka (KSEEB) syllabus include the critical role of biotechnology in agriculture, such as Bt cotton and pest-resistant plants, and in medicine, focusing on the production of recombinant human insulin, gene therapy, and molecular diagnosis. Students will also learn about transgenic animals and ethical issues like biopiracy and patenting. This chapter is highly scoring and frequently tested in board exams through both direct theory and application-based questions.
Start Learning FreeKey Concepts
Bt Cotton
A genetically modified pest-resistant plant containing genes from the bacterium Bacillus thuringiensis that produce proteins to kill specific insect pests like bollworms.
RNA Interference (RNAi)
A cellular defense mechanism in eukaryotes used to silence specific genes by utilizing complementary dsRNA molecules, famously applied to protect tobacco plants from nematodes.
Recombinant Insulin (Humulin)
Artificial human insulin produced using rDNA technology in E. coli to treat diabetes, bypassing the immune reactions caused by animal-derived insulin.
Gene Therapy
A medical technique that corrects defective genes responsible for hereditary diseases, such as introducing a functional ADA gene to treat SCID patients.
Biopiracy
The unauthorized extraction and commercial exploitation of biological resources and traditional knowledge of indigenous peoples by multinational companies without proper compensation.
Important Formulas
Board Exam Info
In the Karnataka (KSEEB) Class 12 Biology board exam, this chapter typically carries around 5 to 7 marks. Questions usually include 1-mark objective questions, 2 or 3-mark short answers on applications like Bt cotton or RNAi, and 5-mark descriptive questions on the production of human insulin or ethical issues.
Frequently Asked Questions
Why doesn't the Bt toxin kill the bacterium Bacillus thuringiensis itself?
The Bt toxin is initially produced as an inactive protein called protoxin inside the bacterium. It becomes active and toxic only when it encounters the alkaline pH of the insect's gut, which solubilizes the crystals.
What is the difference between gene therapy and molecular diagnosis?
Gene therapy aims to cure a genetic disorder by replacing or repairing defective genes, whereas molecular diagnosis involves early detection of diseases using techniques like PCR and ELISA before symptoms appear.
What are GEAC and its role?
GEAC stands for Genetic Engineering Approval Committee. It is a government-set body that makes decisions regarding the validity of research and safety of introducing genetically modified organisms for public services in India.
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