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CBSE Class 12 Biotechnology — Revision Notes

CBSE Class 12 Biotechnology revision notes, chapter by chapter across 13 chapters. Follows the CBSE syllabus. Starts with An Overview of Recombinant DNA.

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  • Active recall: cover the notes, try to recall the key points, then check.
  • Spaced repetition: revise each chapter again after a day, then after a few days, then after a week or two.
  • Write, don't just read: writing key points and formulas out by hand helps them stick.
  • Teach someone: explaining an idea to a friend is a good test of whether you understand it.

Chapter-Wise Revision Notes — 13 Chapters

  • Meaning and Scope of Recombinant DNA Technology
  • Scientific Foundations Behind rDNA Technology
  • Enzymes That Made DNA Manipulation Possible
  • Pioneers and Development of rDNA Technology
Recombinant DNA technology is the setGene cloning is the isolationRestriction enzymes act as scissorsLigase joins two DNA fragments togetherStanley Cohen had expertise in introducing
  • 1. Core idea of host–vector system
  • 2. Features of a good vector
  • 3. Plasmids as vectors
  • 4. Development of plasmid vectors
A host is the organism intoA vector is a DNA moleculePlasmids are circularpBR313 was an original plasmid vectorpUC19 is an improved plasmid cloning
3

Gene Cloning

4 topics
  • 1. Identification of Candidate Gene
  • 2. Isolation of Nucleic Acids
  • 3. Enzymes Used in Recombinant DNA Technology
  • 4. Modes of DNA Transfer
A gene is selected for cloningNucleic acids are isolated by breakingRestriction endonucleases cut DNA at specificNatural DNA transfer in bacteria occursAfter transformation

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Where can I find CBSE Class 12 Biotechnology Revision Notes?

This page has revision notes for 13 chapters of CBSE Class 12 Biotechnology for the board exams 2027. Each chapter links to its own page with the full set.

Go through the syllabus first, then work chapter by chapter: learn the ideas, practise questions, and revise with notes and flashcards. Leave time at the end to revise every chapter once more under timed conditions.

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13 chapters

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