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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

Darwin’s Publication


Natural variation vs artificial selection
Natural Variation called vs Artificial Selection


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

Descent with Modification


The fossil record
The Fossil Record developed different structures to adapt to different environments

Archaeopteryx


Lucy developed different structures to adapt to different environments


Geographic distribution of living species

Section 15-3 developed different structures to adapt to different environments

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 developed different structures to adapt to different environments

Turtle

Alligator

Bird

Mammals

Homologous Body Structures

Typical primitive fish


Vestigial organs
Vestigial Organs developed different structures to adapt to different environments


Similarities in early development
Similarities In Early Development developed different structures to adapt to different environments


Concept map

The fossil record developed different structures to adapt to different environments

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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