Darwin - PowerPoint PPT Presentation


PPT – Darwin PowerPoint presentation | free to download - id: 7c7abc-ZWRiO


The Adobe Flash plugin is needed to view this content

Get the plugin now

View by Category
About This Presentation



Darwin s Theory of Evolution by Natural Selection Galapagos Islands Darwin arrived at the Galapagos Islands in 1835. Collected birds and other animals on the 4 islands. – PowerPoint PPT presentation

Number of Views:59
Avg rating:3.0/5.0
Slides: 15
Provided by: jbo135
Learn more at: http://www.unionacademy.net
Tags: charles | darwin | theory


Write a Comment
User Comments (0)
Transcript and Presenter's Notes

Title: Darwin

Darwins Theory of Evolution by Natural Selection
Galapagos Islands
  • Darwin arrived at the Galapagos Islands in 1835.
  • Collected birds and other animals on the 4
    islands. He noticed that different islands had
    their own slightly different varieties of animals.

Charles Darwin
  • Darwin was a naturalist
  • (collected biological and geological
  • specimens for study)
  • Developed a widely accepted theory of evolution
    through the process of natural selection.
  • Other theories were in place
  • before Darwin developed his theory
  • What two ways did people think change
  • occurred? (think back to our Earth unit)

  • Years later, Darwin determined that the finches
    didnt live anywhere else. He suspected that
    populations of the birds from the mainland
    changed after reaching the Galapagos.
  • Darwin thought that perhaps artificial selection
    (process of breeding to produce desired traits in
    offspring) could work in nature.

Natural Selection
  • Natural selection- The process whereby organisms
    better adapted to their environment tend to
    survive and produce more offspring. If you dont
    adapt, youll die.
  • Nature selects traits for organisms to aid in

What is natural selection
  • This explains Darwins observations of different
    finch birds and their beaks.
  • Darwin thought the different species of finches
    evolved from the same original species in
    response to adaptation to their environment.
  • The overall goal for natural selection and
    evolution is so that animals will be more likely
    to survive and reproduce in the future.

More about natural selection and adaptation
  • Variation is a difference in a physical trait.
  • Galápagos tortoises that live in areas with tall
    plants have long necks and legs. Why would that
    be an advantage?
  • Galápagos finches that live in areas with
    hard-shelled seeds have strong beaks. Why would
    that be an advantage?

Types of adaptations
  • Structural adaptation
  • Protective coloration (Camoflauge)
  • Mimicry 
  • Behavior adaptations (Herds)
  • Hibernation

Structural adaptation
  • A structural adaptation involves some part of an
    animal's body.
  • Teeth
  • Body coverings   
  • Movement

Protective Coloration
  • Also called camouflage
  • Their camouflage makes it hard for enemies to
    single out individuals.  

  • Mimicry allows one animal to look, sound, or act
    like another animal to fool predators into
    thinking it is poisonous or dangerous.

Behavior Adaptations
  • Behavior adaptations include activities that help
    an animal survive. 
  • Behaviour adaptations can be learned or
  • Social behaviour  
  • Behavior for protection  

  • This is deep sleep in which animals body temp
    droops, body activities are slowed to conserve
  • E.g. Bats, woodchucks bears.

Origin of Species
  • In 1859, Darwin published On the Origin of
    Species by Means of Natural Selection.
  • Used the term evolution only on the last page.
  • Evolution- Cumulative changes in groups of
    organisms through time.
  • Natural Selection is the mechanism evolution can
About PowerShow.com