Transcript Darwinian Evolution

Darwinian evolution
I.
II.
III.
IV.
V.
VI.
Introduction
Influences on young Darwin
Definition of evolution
Mechanism
Example
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
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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