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Chapter Summary

Molecular Basis of Inheritance

ICSE · Class 12 · Biology

Summary of Molecular Basis of Inheritance for ICSE Class 12 Biology. Key concepts, important points, and chapter overview.

130 questions45 flashcards5 concepts

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A flowchart illustrating the sequential steps involved in DNA fingerprinting (DNA profiling), from DNA isolation to the detection of hybridized DNA fragments, including restriction digestion, gel elec
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Overview

Molecular basis of inheritance explains how genetic information is stored, copied, expressed, and regulated in living organisms. Genes are the units of heredity, and they are carried on chromosomes as DNA in most organisms. DNA acts as the genetic material because it can replicate faithfully, remain

Key Concepts

A gene is a unit

A gene is a unit of information that directs the activity of the cell or organism during its lifetime and passes its message to the progeny when the c

DNA is the main genetic material

DNA is the main genetic material in living organisms because it is stable, can replicate accurately, can mutate, and can express heredity through prot

Live R

Live R-strain pneumococci did not kill mice, live S-strain killed mice, heat-killed S-strain did not kill mice, but a mixture of heat-killed S-strain

DNA isolated from heat

DNA isolated from heat-killed S cells transformed R cells into S cells. DNAase destroyed transforming ability, but proteases did not. This showed that

T2 bacteriophages were labelled with 35S

T2 bacteriophages were labelled with 35S for protein and 32P for DNA. After infection, 32P was found in bacterial cells while 35S remained in the surr

Learning Objectives

  • Define gene and explain its main properties
  • Describe the search for the genetic material through key experiments
  • Explain the structure of DNA and RNA and compare them
  • Understand Chargaff’s rules and the Watson-Crick model of DNA
  • Describe semi-conservative DNA replication and its proof

Frequently Asked Questions

What are the important topics in Molecular Basis of Inheritance for ICSE Class 12 Biology?
Key topics in Molecular Basis of Inheritance include DNA as Genetic Material — Key Experiments, Meselson-Stahl Experiment, DNA Structure Key Numbers. These are the concepts ICSE Class 12 examiners draw on most — study them first, then practise related questions.
How to score full marks in Molecular Basis of Inheritance — ICSE Class 12 Biology?
Understand the core concepts first, then work through the 130 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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