Class 12 Biology - RAJASTHAN
Biotechnology and its Applications
The chapter 'Biotechnology and its Applications' in Class 12 Biology explores how biological organisms and processes are used for human welfare, especially in agriculture, medicine, and environmental remediation. Rajasthan (RBSE) students will learn practical implementations of recombinant DNA technology. Key topics include genetically modified crops like Bt cotton, therapeutic products such as human insulin, gene therapy, molecular diagnosis techniques like PCR and ELISA, and ethical issues including biopiracy and transgenic animals. This chapter is vital for board exams as it bridges theoretical genetics with real-world applications, carrying significant weightage in both objective and descriptive questions.
Start Learning FreeKey Concepts
Bt Cotton
A genetically modified pest-resistant plant containing genes from Bacillus thuringiensis that produces toxic proteins to kill bollworms.
RNA Interference (RNAi)
A cellular defense mechanism used in eukaryotes to silence specific genes by targeting mRNA, notably used to protect tobacco plants from nematode infection.
Genetically Engineered Insulin
Production of human insulin (Humulin) using recombinant DNA technology in E. coli bacteria by assembling chains A and B separately.
Gene Therapy
A corrective medical technique to treat hereditary diseases by inserting a normal, functional gene into cells to replace a defective one.
Molecular Diagnosis
Early disease detection methods like PCR (Polymerase Chain Reaction) and ELISA that identify pathogens or mutations at the molecular level.
Biopiracy and Biopatents
The unauthorized extraction of biological resources and traditional knowledge by companies without proper compensation to the native countries or indigenous people.
Important Formulas
Board Exam Info
In the Rajasthan (RBSE) Class 12 Biology board examination, this chapter typically carries around 4 to 6 marks. Questions commonly include short-answer questions on Bt cotton and gene therapy, and essay-type questions explaining the production of recombinant insulin or applications in agriculture.
Frequently Asked Questions
Why doesn't the Bt toxin kill the bacterium Bacillus thuringiensis?
The toxin is produced in an inactive form called protoxin inside the bacterium. It becomes active only when exposed to the alkaline pH of an insect's gut.
What is the main difference between gene therapy and molecular diagnosis?
Molecular diagnosis is used to detect diseases early using techniques like PCR and ELISA, whereas gene therapy is used to treat or cure genetic disorders by replacing faulty genes.
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 biological products like human proteins, and for chemical safety testing.
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