darwinian evolution i.introduction ii.influences on young darwin iii.definition of evolution...
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Darwinian evolution
I. IntroductionII. Influences on young DarwinIII. Definition of evolutionIV. MechanismV. Example VI. Pieces of evidence supporting theory
I. Intro to Darwinian evolution
• Unifying principle of biology
• Helps to explain how change has occurred over time
• Nothing magical about how it occurs
Influences on a young Charles Darwin
II. Influences on a young Darwin
A. Family Background
• 1. religious family• 2. professions considered• 3. naturalist
B. Voyage of the Beagle
C. Galapagos Islands
• 1. Tortoises• 2. Iguanas• 3. Finches• 4. Adaptive
radiation
D. Thomas Malthus
• 1. Economist• 2. Malthusian
Principle• 3. Introduced the
concept of struggle
E. Artificial selection
• 1. man’s selection of breeding pairs to produce desired “phenotype”
• 2. examples• 3. significance
III. Definition of evolution
• A. Slow and gradual change over time in organisms appearance in response to environmental change
• B. Organisms living today appear different than their ancestors
• C. Living organisms share common ancestors
IV. Mechanism of Change/Natural Selection
• A. Variation exists in all populations
• B. Reproductive potential
• C. Variable fitness• D. Environmental
carrying capacity• Differential reproduction• Slow gradual change in
phenotype
V. Example of evolutionary change
• Size of beagle ears
• Environment changes
• Results
VI. Evidence of evolutionary change
• A. Vestigial structures
• B. Homologous structures
Evidence cont.
• C. Common embryology
Evidence cont.
• C. Common embryology
• D. Fossil record– 1. Missing links
Evidence cont.
• C. Common embryology
• D. Fossil record– 1. Missing links– 2. Phylogenies