EVIDENCE OF EVOLUTION

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EVIDENCE OF EVOLUTION

• CHAPTER 15-2

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EVOLUTION DEFINED

• Evolution is a process of gradual modifications

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EVOLUTION DEFINED

• Evolution is a process of gradual modifications
• Darwin called this descent with modification

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COMMON ANCESTOR

• Many animals and plants shared common ancestors
  and deviated from that common ancestor overtime.

Organism 1
Ancestor
Organism 2
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(No Transcript)
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7 LINES OF EVIDENCE SUPPORTING THE THEORY OF
EVOLUTION
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1. Paleontology

• Fossils provide geologic evidence of evolution
• Fossils in older layers are more primitive than
  those in the upper layers

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1. Paleontology

• Fossils provide geologic evidence of evolution
• Fossils in older layers are more primitive than
  those in the upper layers
• Shows that life has become more complex.
• Shows that life on earth has not always been the
  same

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• Transitional Species
• Direct descendants of modern day species
• Fossil record contains the intermediates
• Descent with modification states that newer
  species are modified versions of older species

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2. VESTIGIAL STRUCTURES

• Remnants of organs or structures that had a
  function in an early ancestor.

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2. VESTIGIAL STRUCTURES

• Remnants of organs or structures that had a
  function in an early ancestor.
• Shows that these organisms are descendants from
  organisms that used them.
• Ex Whale hind leg bones

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3. HOMOLOGOUS STRUCTURES

• Body parts that are similar in structure, but may
  have different functions

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3. HOMOLOGOUS STRUCTURES

• Body parts that are similar in structure, but may
  have different functions
• Indicating at some point way in the past they did
  the same job and came from a common ancestor

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FEATHERS
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4. ANALOGOUS STRUCTURES

• Same functions but different development

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4. ANALOGOUS STRUCTURES

• Same functions but different development
• ex. a butterfly wing and a bat wing
• Indicates that populations evolve to be better
  suited to the environment

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5. Biogeography

• Geographical distribution of living creatures.

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5. Biogeography

• Geographical distribution of living creatures.
• Similar species are found in similar places
  showing common ancestry.
• (divergent evolution)
• Ex marsupials in Australia

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6. Embryology

• Some stages of embryo development of different
  organisms are similar
• Shows common ancestry

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7. Biological Molecules

• DNA ? RNA? Proteins
• Similar proteins means similar DNA

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7. Biological Molecules

• DNA ? RNA? Proteins
• Similar proteins means similar DNA
• The more similar proteins means they share a
  recent common ancestor

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Whale Video

• http//www.teachertube.com/viewVideo.php?titleWha
  le_evolutionvideo_id65653