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Theme D: Continuity and Change

This chapter explores the continuity of life through genetic mechanisms such as DNA replication, protein synthesis, and mutation, as well as the processes of inheritance and evolution. It delves into cellular functions like division and gene expression, emphasizing hormonal and environmental controls that maintain homeostasis. The impact of natural selection, coupled with the challenges of climate change, highlights the dynamic relationship between stability and change in biological systems.

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Sections

  • D

    Continuity And Change

    This section discusses the mechanisms of inheritance and the processes driving biological changes over time, including DNA replication, protein synthesis, mutations, and adaptation to environmental changes.

    Learning Practice

  • D1.1

    Dna Replication

    DNA replication is a highly accurate process that copies the entire genome of a cell to ensure each daughter cell receives the correct genetic information.

    Learning Practice

  • D1.2

    Protein Synthesis

    Protein synthesis involves the decoding of mRNA to form polypeptide chains, integral to gene expression.

    Learning Practice

  • D1.3

    Mutation And Gene Editing

    This section explores mutations, their types, sources, and the significance of gene editing technologies in biology.

    Learning Practice

  • D2.1

    Cell And Nuclear Division

    This section explores the processes of cell and nuclear division, emphasizing the mechanisms that ensure the accurate segregation of genetic material during mitosis and meiosis.

    Learning Practice

  • D2.2

    Gene Expression (Hl Only)

    This section delves into the intricacies of gene expression, highlighting its mechanisms, regulation, and the impact of epigenetics and noncoding RNAs.

    Learning Practice

  • D3.1

    Reproduction

    Reproduction is vital for the continuity of species, encompassing both asexual and sexual methods.

    Learning Practice

  • D3.2

    Inheritance

    Inheritance encompasses the transmission of genetic traits from parents to offspring, exploring Mendelian principles and modern genetics.

    Learning Practice

  • D3.3

    Homeostasis

    Homeostasis is the process by which organisms maintain a stable internal environment amid external changes.

    Learning Practice

  • D4.1

    Natural Selection

    Natural selection is a key mechanism of evolution whereby individuals with favorable traits reproduce more successfully than those without, leading to changes in population traits over time.

    Learning Practice

  • D4.2

    Stability And Change

    This section explores how biological systems maintain stability while also undergoing change through processes like population dynamics, community ecology, and species interactions.

    Learning Practice

  • D4.3

    Climate Change

    Climate change is defined by long-term alterations in temperature and weather patterns, significantly influenced by human activities, primarily the emission of greenhouse gases.

    Learning Practice

  • 1

    Introduction

    This section introduces Theme D, which explores the continuity and change in biological systems through genetics and evolutionary processes.

    Learning Practice

References

Untitled document (12).pdf

Class Notes

Memorization

What we have learnt

  • Genetic information is pass...
  • Cellular processes such as ...
  • Homeostasis is maintained t...

Final Test

Revision Tests

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