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Gene Cloning — Study Plan

CBSE · Class 12 · Biotechnology

A step-by-step study plan for Gene Cloning, CBSE Class 12 Biotechnology: what to learn first, what to practise and when to revise.

72 questions88 flashcards5 concepts

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A diagram illustrating the concept of insertional inactivation using a chromogenic substrate, where insertion of foreign DNA into a gene (e.g., β-galactosidase) inactivates it, leading to a visible ch
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Study Plan

1
Day 1–2

Learn the Theory

Read the textbook chapter carefully. Note down definitions, formulas and key ideas. Focus on: 1. Identification of Candidate Gene, 2. Isolation of Nucleic Acids, 3. Enzymes Used in Recombinant DNA Technology.

2
Day 3

Practise

Solve the textbook exercises and extra practice questions. There are 72 questions available for this chapter.

3
Day 4

Revise & Test

Revise key points without looking at your notes. Take a practice quiz and mark weak areas for another pass.

4
Day 7

Spaced Revision

Come back to Gene Cloning after a week. Use flashcards for quick recall and try past exam questions on this chapter.

What to Focus On

  • Candidate genes are selected for useful traits or biological importance.
  • The human genome is extremely large, making gene identification difficult.
  • mRNA from a specific tissue can be used to make cDNA for cloning.
  • DNA and RNA must be protected from nuclease damage during extraction.
  • Lysozyme is used for bacterial cell wall digestion.
  • CTAB is used for plant DNA isolation.
  • Exonucleases remove nucleotides from DNA ends.
  • Endonucleases cut inside DNA or RNA molecules.
  • Type II restriction enzymes are the ones used in recombinant DNA technology.

Common Mistakes to Avoid

All restriction enzymes cut DNA in the same way, so any restriction enzyme can be used equally in recombinant DNA technology.

HindII and HindIII are the same enzyme, and both refer to the first restriction enzyme isolated.

DNA ligase always works in the same way, so E. coli DNA ligase and T4 DNA ligase can be used interchangeably for any DNA joining task.

Memory Tips

Meaning of gene cloning

Difficulty of finding a gene in the genome

Candidate gene from mRNA using reverse transcriptase

Lysozyme action in bacterial DNA isolation

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Frequently Asked Questions

What are the important topics in Gene Cloning for CBSE Class 12 Biotechnology?
Key topics in Gene Cloning include Identification of Candidate Gene, Isolation of Nucleic Acids, Enzymes Used in Recombinant DNA Technology, Modes of DNA Transfer. Study these first, then practise questions on each for the CBSE Class 12 board exam.
How should I revise Gene Cloning for the CBSE Class 12 board exam?
Learn the core ideas first, then work through the 72 practice questions on Gene Cloning. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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