Class 12 Biology Chapter 6 Evolution Notes (Short and Handwritten Notes PDF)

Hi students,

If you are a class 12 student and looking for a nice and simple notes for chapter 6 “Evolution” of Biology, then you are at the right place. This chapter is very important for board exams, and our notes will make your preparation extremely easy.

These notes are specially created by analyzing NCERT latest syllabus and last 10 years board exam question papers.

In this article, we have given complete notes of Class 12 Biology Chapter 6 Evolution (NCERT Class 12 Biology). In this note, every point is written in easy language so that you can understand this lesson easily. This note is based on NCERT. That is, this note is useful for all those children who study NCERT in English medium.

Here we have given the Notes in PDF format which you can download so that you can print it and save your time. To download, click on the given Download PDF link.

Evolution Notes PDF Download

Important topics covered in the notes

• Origin of Life
  • The Big Bang theory.
  • Oparin-Haldane hypothesis.
  • Miller’s experiment (Experimental evidence for chemical evolution).
• Evidences for Evolution
  • Paleontological Evidence (Fossils).
  • Embryological Evidence.
• Comparative Anatomy and Morphology:
  • Homologous Organs.
  • Analogous Organs.
• Theories of Evolution
  • Lamarckism.
• Darwinism:
  • Theory of Natural Selection.
• Mechanism of Evolution
  • Mutation.
  • Recombination.
• Hardy-Weinberg Principle
  • Explanation of the principle.
• Factors affecting Hardy-Weinberg equilibrium:
  • Gene Flow.
  • Genetic Drift.
  • Mutation.
  • Genetic Recombination.
  • Natural Selection.
• A Brief Account of Evolution
  • Evolution of plant forms and animals through different geological periods.
• Origin and Evolution of Man
  • Dryopithecus, Ramapithecus, Australopithecines.
  • Homo habilis, Homo erectus.
  • Neanderthal man.
  • Homo sapiens (Modern Man).

Class 12 biology chapter 6 Handwritten Notes PDF

Evolution Notes- lesson summary

1. Evolution: The process of gradual modification of simpler forms into the present complex forms over millions of years is called evolution.
2. Origin of life: A scientific theory called the big bang theory explains that an unimaginable large explosion created the universe.
3. Evolution of life forms-
   • All living organisms were created as such
   • The diversity in all organisms has always the same since creation and will be the same in future
   • Earth is about 4000 years old
4. Homologous organs: The organs whose structure or origin is same but functionally different
5. Analogous organs: The organs whose structure or origin is not similar but functionally active are called analogous organs
6. Adaptive radiation: The evolution of different species in a given geographical area starting from its original character and radiating to other geographical area is called adaptive radiation
7. Mechanism of evolution: Evolution needs variations. Origin of variation and reason for speciation is inheritable factors influencing phenotype.
8. A brief account of evolution: About 2000 million years ago (mya) the first cellular forms of life appeared on earth
9. Origin and evolution of man: The stages of evolution of man are
   • Dryopithecus and Ramapithecus
   • Australopithecus:
   • Homo habilis:

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