What is evolution?

1
What is evolution?
NB 2

• The process in which organisms change over time

2
Jean-Baptiste de Lamarck

• A French Naturalist (studies nature)
• In 1809, 1st scientist to propose a theory on
  evolution

3
Theory

• An explanation that is supported by evidence.

4
Charles Darwin

• A British Naturalist
• In 1831, sailed on the HMS Beagle and visited the
  Galapagos Islands and collected lots of data.
• In 1859, he published a book, On the Origin of
  Species, proposing his theory of evolution.

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Lamarck -vs- Darwin

• Organisms acquire traits and pass them on to
  their offspring

• Organisms that are better adapted to their
  environment survive and reproduce more
  successfully

6
To obtain

• A lion runs a lot so he gets stronger leg muscles
  than the other lions. Because the lion got
  stronger legs muscles he could then pass this
  trait on to his offspring.

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Having a trait that improves an organisms ability
in a particular environment

• There are giraffes with long necks and giraffes
  with short necks. Giraffes like to eat the leaves
  off of trees. After several years of drought, the
  short neck giraffes become extinct due to lack of
  food. But, the long neck giraffes can reach the
  tops of trees to continue to get their food.

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Who do you agree with?

• Lamarck
  Darwin
• Traits were Certain
  inherited
• acquired traits
  allowed an
• and passed organism to
• to offspring survive
  better in a
• 
  particular
• 
  environment

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The Carefully Concealed Colors Caper

• Read the paragraph.
• Think about how your assigned naturalist would
  explain .
• Where did the green trait come from?
• Why are most of the Zirconians green and not red
  when the astronauts returned?
• Pair up and Share your findings.
• (Take notes if necessary)

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Video Clip

• Write down 5 facts.
• Be prepared to submit one test question from your
  facts.
• Clip

11
Homework Word WebsComplete an organizer for
each word

• Adaptation
• Natural Selection
• Species
• Speciation