Chapter 16 section 1 Darwin's Voyage of Discovery

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Chapter 16 section 1 Darwin's Voyage of Discovery
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Key Questions

• What was Charles Darwin's contribution to
  science?
• What three patterns of biodiversity did Darwin
  note?

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Darwin

• British, 1809-1882
• Studied medicine at Univ. of Edinburgh
• Studied theology at Cambridge
• 1831, HMS Beagle

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Darwin's Journey

• Patterns of biodiversity
• 1. Species vary globally
• Flightless birds
• 2. Species vary locally
• Finches/tortoises
• 3. Species vary over time
• Fossils
• Patterns

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Chapter 16 sec 2Ideas That Shaped Darwin's
Thinking
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Key Questions

• What did Hutton and Lyell conclude about Earth's
  history?
• How did Lamarck proposed that species evolve?
• What was Malthus's view of population growth?
• How is inherited variation used in artificial
  selection?

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Influences Hutton and Lyell

• Law of Uniformitarianism
• Outcome Earth Changes, do living things?

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Influences Lamarck

• BeforeSpecies unchanging divine creation
• French Scientist (1744-1829)
• How organisms changed
  over time
• Theory of Use and Disuse
• Birds webbed feet
• Giraffe
• WRONG!!!
• Outcome Organisms change somehow

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Influences Malthus

• 1798
• Uncontrolled population growth
• Outcome Few individuals survive......how?

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Influences Artificial Selection

• Breeders
• More pronounced traits
• Bananaseeds
• Outcome Some variations
  are better

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Chapter 16 Sec 3Darwin Presents His Case
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Key Questions

• Under what conditions does natural selection
  occur?
• What does Darwin's mechanism for evolution
  suggest about living and extinct species?

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Darwin

• Alfred Russell Wallace
• On the Origin of Species by Means of Natural
  Selection

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Conditions for Natural Selection

• Struggle for existence
• Variation and Adaptation
• Survival of the Fittest
• It's all about....
• ....reproduction!
• p. 462

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Natural Selection Peppered Moth
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Natural Selection Peppered Moths

• Favorable traits passed on
• The black peppered -- dark forest
• The white peppered moths -- light forest
• Adaptation
• Adapt ? natural selection

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Common Descent

• Well adapted survive, reproduce
• Descent with Modification
• Evidence fossil record
• Evolutionary trees