Gene Cloning
CBSE · Class 12 · Biotechnology
Step-by-step guide to study Gene Cloning in CBSE Class 12 Biotechnology. Topics to cover, practice strategy, and time allocation.
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Learn the Theory
Read the textbook chapter carefully. Note down definitions, formulas, and key concepts.
Practice Problems
Solve textbook exercises and additional practice questions. Focus on numerical problems and application-based questions.
Revise & Test
Revise key formulas and concepts without looking at notes. Take a practice quiz to test your understanding. Mark weak areas for re-revision.
Spaced Revision
Revisit Gene Cloning after a week. Use flashcards for quick recall. Solve previous year questions from this chapter.
What to Focus On
- A candidate gene is selected based on its biomedical, agricultural, or economic significance
- A haploid human genome contains approximately 3.2 billion base pairs
- A typical gene is only 3,000–3,500 bp — about one-millionth of the entire genome
- Two major challenges in nucleic acid isolation: small quantities relative to other biomolecules, and susceptibility to physical/chemical damage
- Four steps in nucleic acid isolation: cell disruption, protection from degrading enzymes, separation from other molecules, precipitation
- Lysozyme digests bacterial cell wall; SDS disrupts cell membranes
- Exonucleases remove nucleotides from the ends; endonucleases cleave internal bonds
- Restriction enzymes recognise specific palindromic sequences of 4–8 bp
- Type II restriction enzymes are used in rDNA technology as they cleave within the recognition sequence and need only Mg²⁺
Common Mistakes to Avoid
In blue-white selection, blue colonies contain recombinant DNA (with insert) and white colonies are non-recombinant.
Restriction enzymes cut DNA at random positions to generate fragments of different sizes.
All three types of restriction enzymes (Type I, II, III) are used in recombinant DNA technology.
Memory Tips
Steps of DNA Isolation (4 steps)
Role of EDTA in DNA extraction
Restriction Enzyme Nomenclature (e.g., EcoRI)
Type I, II, III Restriction Enzymes — differences
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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