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Molecular Basis of Inheritance

Madhya Pradesh Board · Class 12 · Biology

Quick revision notes for Molecular Basis of Inheritance — Madhya Pradesh Board Class 12 Biology. Key concepts, formulas, and definitions for last-minute revision.

30 questions50 flashcards5 concepts

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A labeled diagram illustrating the Watson and Crick model of DNA, showing the double helical structure, antiparallel strands, sugar-phosphate backbone, nitrogenous base pairing (A-T, G-C) with hydroge
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Key Topics to Revise

1

DNA Structure and Packaging

  • DNA is a double-stranded helical polymer of deoxyribonucleotides
  • Watson-Crick model (1953) proposed based on X-ray crystallography by Rosalind Franklin and Maurice Wilkins
  • Chargaff's rule: A=T and G=C ratios are equal in double-stranded DNA
2

Search for Genetic Material

  • Friedrich Griffith's transformation experiment (1928) with Streptococcus pneumoniae
  • S strain (smooth, virulent) vs R strain (rough, non-virulent)
  • Heat-killed S strain + live R strain = transformation of R to S (mice died)
3

DNA Replication

  • Semiconservative replication proposed by Watson and Crick
  • Meselson-Stahl experiment (1958) proved semiconservative nature using ¹⁵N and ¹⁴N
  • Each new DNA molecule has one parental and one newly synthesized strand
4

Transcription

  • Process of copying genetic information from DNA to RNA
  • Only one DNA strand (template strand 3' to 5') is transcribed
  • RNA polymerase catalyzes RNA synthesis in 5' to 3' direction

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Full Notes

Key Concepts

DNA is a doubleIn prokaryotesThe Central Dogma describes the flowDNA replication is semiconservativeTranscription is the synthesis of RNA

Frequently Asked Questions

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Molecular Basis of Inheritance covers several key topics that are frequently asked in Madhya Pradesh Board Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Molecular Basis of Inheritance — Madhya Pradesh Board Class 12 Biology?
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Sources & Official References

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

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