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Molecular Basis of Inheritance

Odisha Board · Class 12 · Biology

Complete topic list for Molecular Basis of Inheritance in Odisha Board Class 12 Biology. Key concepts, sub-topics, and what to focus on for board exams.

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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4 Topics · Odisha Board Class 12 Biology

Topics in Molecular Basis of Inheritance

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

Key Concepts

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

Frequently Asked Questions

What are the important topics in Molecular Basis of Inheritance for Odisha Board Class 12 Biology?
Molecular Basis of Inheritance covers several key topics that are frequently asked in Odisha 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 — Odisha Board Class 12 Biology?
Understand the core concepts first, then work through the 30 practice questions available for this chapter. Revise formulas and 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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