Download Evolution

Evolution
Evolution – change over time
• Geological
• Stellar
• “The Big Bang theory”
Evolution – change over time
• Biological
▫ Microevolution – changes in a species
Evolution – change over time
• Biological
▫ Macroevolution –
new species (speciation)
Theories that attempt to explain the
diversity of life:
• Biological (Atheistic)Evolution
• Creationism 
church approved
• Intelligent Design (ID)
• Theistic evolution 
church approved
Evolution doesn’t attempt to explain:
• What life is or where it came from
 Biogenesis vs. spontaneous generation
• How matter came to exist
▫ Matter cannot be created or destroyed
• How order comes from chaos
▫ Law of entropy – order is result of input of energy
into a system.
Biological Evolution
• What it does explain is how diversity originates,
and the relationships between species.
• It is widely accepted in the scientific world
• (What is a theory? Remember? It is NOT just
an idea.)
Biological Evolution
• Charles Darwin
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Early-mid 1800’s
The HMS Beagle, ship’s naturalist
5-year voyage around the world
Galapagos finches
Origin of Species
Evidences for evolution
• DNA/Biochemical evidence
• Homologous structures
Evidences for evolution
• Fossil record
• Ontogeny recapitulates
phylogeny
Tools of evolution
• Genetic variation
▫ Sexual reproduction
▫ Genetic recombination (crossing over in meiosis)
▫ Mutation
eastern meadowlark song
Tools of evolution
• Genetic variation
• Reproductive isolation
western meadowlark song
Tools of evolution
• Genetic variation
• Reproductive isolation
• Natural selection “survival of the fittest”
▫ Ie. Industrial melanism
Tools of evolution
• Genetic variation
• Reproductive isolation
• Natural selection “survival of the fittest”
▫ Ie. Industrial melanism
▫ Ie. Long neck of
the giraffe
Tools of evolution
• Genetic variation
• Reproductive isolation
• Natural selection “survival of the fittest”
▫ Ie. Antimicrobic resistance