Unit%205%20Evolution

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Unit 5 Evolution

• Evidence of Evolution

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Evidence 1

• Fossil impression of dead organism made on a
  surface
• Types
• Mold imprint on surface in shape of organism
• Cast mold that has been filled w/minerals to
  form a model

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Australia
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Distribution of Fossils

• Law of superposition layers of materials
  accumulated on the organism
• Bottom layer oldest
• Top layer youngest

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Succession of forms

• 1. Extinction
• 2. Mass extinction large population of species
  disappear in a short period of time
• Reasons

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Evidence 2

• Homologous structures structures that are
  similar in different species
• May have common ancestor
• Different functions
• Example

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Evidence 2

• Analogous structures structures of different
  species that have same function
• Look similar
• May not have common ancestor
• Example

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Homologous and Analogous
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Analogous Structures
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Evidence 2

• Vestigial organ existing structures used by
  ancestors but not by current species
• Example

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Evidence 3

• Embryology
• Embryo first stage of developing organism
• All vertebrates show similar features in embryo
  stage

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Evidence 4

• Macromolecules
• Amino Acid and DNA sequences are similar for
  certain species
• -Common ancestor

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Patterns of Evolution

• Coevolution different species adapt over time
  with one another
• can be btwn species of mutualism
• Example

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Coevolution
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Patterns of Evolution

• Convergent Evolution species not closely related
  adapt similar traits to their environment
  separately
• Analogous structures result
• Phenotypes converge
• Example

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Patterns of Evolution

• Divergent Evolution 2 or more related species
  become more different over time
• Different habitats
• Adaptive radiation arise from 1 common ancestor
• Example
• Artificial selection diverging due to unnatural
  occurrences
• Example

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