15 3 darwin presents his case
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15.3 – Darwin Presents His Case. After Darwin’s journeys he wrote and published a book called On the Origin of Species In this book he proposed his thoughts on how evolution happened called natural selection. Darwin’s Publication. Natural Variation vs Artificial Selection.

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darwin s publication

After Darwin’s journeys he wrote and published a book called On the Origin of Species

  • In this book he proposed his thoughts on how evolution happened called natural selection
Darwin’s Publication
evolution by natural selection

Darwin proposed that as populations grew that there would be a struggle for existence

  • A key factor in the above would be survival of the fittest
    • Successful adaptions enable organisms to be better suited for environment
    • Those adaptations are then passed on to next generations
    • Those that are adapted best for their environment will have more offspring and those that are not will either die or have few offspring
    • http://www.youtube.com/watch?v=nS1tEnfkk6M
    • http://www.youtube.com/watch?v=GPbWJPsBPdA&feature=fvsr
Evolution by Natural Selection
descent with modification

Darwin proposed that over long periods of time organisms developed different structures to adapt to different environments

  • As a result species today look different from their ancestors
  • Common Descent
    • All species-living and extinct-were derived from same ancestors
Descent with Modification
the fossil record
The Fossil Record

Archaeopteryx

geographic distribution of living species

Section 15-3

Beaver

Beaver

Muskrat

Beaver andMuskrat

Coypu

Capybara

Coypu andCapybara

NORTH AMERICA

Muskrat

Capybara

SOUTH AMERICA

Geographic Distributionof Living Species

Coypu

homologous body structures

Section 15-3

Turtle

Alligator

Bird

Mammals

Homologous Body Structures

Typical primitive fish

concept map

The fossil record

Geographic distribution of living species

Homologous body structures

Similaritiesin early development

Physical remains of organisms

Common ancestral species

Similar genes

Similar genes

Evidence of Evolution

includes

which is composed of

which indicates

which implies

which implies

Concept Map
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