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EVOLUTION Life on earth began as simple and primitive forms, by natural selection, over a long time

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Page 1: EVOLUTION Life on earth began as simple and primitive forms, by natural selection, over a long time various complex organisms form

EVOLUTION

Life on earth began as simple and primitive

forms, by natural selection, over a long time various complex

organisms form

Page 2: EVOLUTION Life on earth began as simple and primitive forms, by natural selection, over a long time various complex organisms form

Evidences of Evolution

1. Paleontology

2. Geographical distribution of

organisms

3. Comparative anatomy

4. Embryology

5. Comparative bio-chemistry

Page 3: EVOLUTION Life on earth began as simple and primitive forms, by natural selection, over a long time various complex organisms form

PaleontologyStudy of fossil:

Differences between ancient and recent form of an organism

Page 4: EVOLUTION Life on earth began as simple and primitive forms, by natural selection, over a long time various complex organisms form

Development of Horse

Page 5: EVOLUTION Life on earth began as simple and primitive forms, by natural selection, over a long time various complex organisms form

Development of Whale

Page 6: EVOLUTION Life on earth began as simple and primitive forms, by natural selection, over a long time various complex organisms form

Geographical distribution of organisms

Owing to geographical isolation, organisms adapted to that isolated

habitat and become different. (adaptive radiation)

Page 7: EVOLUTION Life on earth began as simple and primitive forms, by natural selection, over a long time various complex organisms form

Migration between continents

Page 8: EVOLUTION Life on earth began as simple and primitive forms, by natural selection, over a long time various complex organisms form

Finch Beak

Page 9: EVOLUTION Life on earth began as simple and primitive forms, by natural selection, over a long time various complex organisms form
Page 10: EVOLUTION Life on earth began as simple and primitive forms, by natural selection, over a long time various complex organisms form

Galapagos tortoise

Page 11: EVOLUTION Life on earth began as simple and primitive forms, by natural selection, over a long time various complex organisms form

Comparative anatomyHomologous structures as pentadactyl limb have same fundamental structure but different function

Page 12: EVOLUTION Life on earth began as simple and primitive forms, by natural selection, over a long time various complex organisms form

Eye Evolution

Page 13: EVOLUTION Life on earth began as simple and primitive forms, by natural selection, over a long time various complex organisms form

Although adult structure is different, structure in embryonic stage is similar.

Embryology

Page 14: EVOLUTION Life on earth began as simple and primitive forms, by natural selection, over a long time various complex organisms form

Comparative bio-chemistry

Page 15: EVOLUTION Life on earth began as simple and primitive forms, by natural selection, over a long time various complex organisms form

Mechanism of Evolution

Lamarck’s Theory• Change in environment• Organism modify itself• More used organ enlarge• Less used degenerate• The acquired character is

inheritable

Darwin’s Theory• Change in environment• Population has inborn

different• Some good feature fit the

environment survive (natural selection)

• These reproduce and become new species

Page 16: EVOLUTION Life on earth began as simple and primitive forms, by natural selection, over a long time various complex organisms form

Neo-Darwinism1. Variation : Mutation and sexual reproduction

2. Natural Selection: The fittest has better chance to survive

and reproduce

3. Speciation: New species formation is caused by isolation

•Geographic isolation: physical barrier

•Ecologic isolation: different season or zone in habitat

•Reproductive isolation: different reproductive behavior

•Genetic isolation: genetic different due to isolation

Page 17: EVOLUTION Life on earth began as simple and primitive forms, by natural selection, over a long time various complex organisms form

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