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Class 12 · Biology · Chapter 6

Evolution

Evolution traces the story of life on earth — how it began and how the diversity we see today came about. The chapter moves from the origin of the universe and the early earth, through the chemical origin of life and Miller's experiment, to the theories of Lamarck and Darwin, the many lines of evidence for evolution (fossils, comparative anatomy, embryology and molecular biology), adaptive radiation, the mechanisms that drive change (variation, mutation and the types of natural selection), the Hardy–Weinberg principle and the forces that disturb it, the geological timeline of life, and finally the evolution of our own species. Total: 17 sections including dedicated Solved Examples, Board and NEET practice, and a Summary.

17 sections · ~555 min read · Free, no login needed
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Topics in this chapter

  1. 1

    Origin of Life — Early Earth & the Theories

    30 min read · Quiz included

  2. 2

    Chemical Evolution & the Miller–Urey Experiment

    30 min read · Quiz included

  3. 3

    Theories of Evolution — Lamarckism, Darwin & Wallace

    30 min read · Quiz included

  4. 4

    Evidences for Evolution I — Fossils

    25 min read · Quiz included

  5. 5

    Evidences for Evolution II — Homology, Analogy, Embryology & Molecular

    30 min read · Quiz included

  6. 6

    Adaptive Radiation — Darwin's Finches & Marsupials

    30 min read · Quiz included

  7. 7

    Biological Evolution — Natural Selection in Action

    30 min read · Quiz included

  8. 8

    Mechanism of Evolution — Variation, Mutation & de Vries' Theory

    30 min read · Quiz included

  9. 9

    Types of Natural Selection — Stabilising, Directional & Disruptive

    30 min read · Quiz included

  10. 10

    Hardy–Weinberg Principle — Genetic Equilibrium & the Equation

    30 min read · Quiz included

  11. 11

    Factors That Change Allele Frequency — Drift, Gene Flow & Founder Effect

    30 min read · Quiz included

  12. 12

    A Brief Account of Evolution — The Geological Timeline of Life

    35 min read · Quiz included

  13. 13

    Origin & Evolution of Man

    35 min read · Quiz included

  14. 14

    Solved Examples

    55 min read

  15. 15

    Board Exam-Pattern Questions

    50 min read

  16. 16

    NEET-Pattern Practice Questions

    25 min read · Quiz included

  17. 17

    Summary & Exam Tips

    30 min read