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.
Topics in this chapter
- 1
Origin of Life — Early Earth & the Theories
30 min read · Quiz included
- 2
Chemical Evolution & the Miller–Urey Experiment
30 min read · Quiz included
- 3
Theories of Evolution — Lamarckism, Darwin & Wallace
30 min read · Quiz included
- 4
Evidences for Evolution I — Fossils
25 min read · Quiz included
- 5
Evidences for Evolution II — Homology, Analogy, Embryology & Molecular
30 min read · Quiz included
- 6
Adaptive Radiation — Darwin's Finches & Marsupials
30 min read · Quiz included
- 7
Biological Evolution — Natural Selection in Action
30 min read · Quiz included
- 8
Mechanism of Evolution — Variation, Mutation & de Vries' Theory
30 min read · Quiz included
- 9
Types of Natural Selection — Stabilising, Directional & Disruptive
30 min read · Quiz included
- 10
Hardy–Weinberg Principle — Genetic Equilibrium & the Equation
30 min read · Quiz included
- 11
Factors That Change Allele Frequency — Drift, Gene Flow & Founder Effect
30 min read · Quiz included
- 12
A Brief Account of Evolution — The Geological Timeline of Life
35 min read · Quiz included
- 13
Origin & Evolution of Man
35 min read · Quiz included
- 14
Solved Examples
55 min read
- 15
Board Exam-Pattern Questions
50 min read
- 16
NEET-Pattern Practice Questions
25 min read · Quiz included
- 17
Summary & Exam Tips
30 min read