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  • Slide 1
  • EVIDENCE OF EVOLUTION CHAPTER 15-2
  • Slide 2
  • EVOLUTION DEFINED Evolution is a process of gradual modifications
  • Slide 3
  • EVOLUTION DEFINED Evolution is a process of gradual modifications Darwin called this descent with modification
  • Slide 4
  • COMMON ANCESTOR Many animals and plants shared common ancestors and deviated from that common ancestor overtime. Organism 1 Organism 2 Ancestor
  • Slide 5
  • Slide 6
  • 7 LINES OF EVIDENCE SUPPORTING THE THEORY OF EVOLUTION
  • Slide 7
  • 1. PALEONTOLOGY Fossils provide geologic evidence of evolution Fossils in older layers are more primitive than those in the upper layers
  • Slide 8
  • 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
  • Slide 9
  • 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
  • Slide 10
  • 2. VESTIGIAL STRUCTURES Remnants of organs or structures that had a function in an early ancestor.
  • Slide 11
  • 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
  • Slide 12
  • 3. HOMOLOGOUS STRUCTURES Body parts that are similar in structure, but may have different functions
  • Slide 13
  • 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
  • Slide 14
  • FEATHERS
  • Slide 15
  • 4. ANALOGOUS STRUCTURES Same functions but different development
  • Slide 16
  • 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
  • Slide 17
  • 5. BIOGEOGRAPHY Geographical distribution of living creatures.
  • Slide 18
  • 5. BIOGEOGRAPHY Geographical distribution of living creatures. Similar species are found in similar places showing common ancestry. (divergent evolution) Ex: marsupials in Australia
  • Slide 19
  • 6. EMBRYOLOGY Some stages of embryo development of different organisms are similar Shows common ancestry
  • Slide 20
  • 7. BIOLOGICAL MOLECULES DNA RNA Proteins Similar proteins means similar DNA
  • Slide 21
  • 7. BIOLOGICAL MOLECULES DNA RNA Proteins Similar proteins means similar DNA The more similar proteins means they share a recent common ancestor
  • Slide 22
  • WHALE VIDEO http://www.teachertube.com/viewVideo.php?title=Whale_evol ution&video_id=65653

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