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Evolution Introduction - Honors Biology

Introduction and history of evolution. Images from Campbell Biology, 7th ed. Copyright Pearson 2005 and Wiki Commons. Used under fair-use rights.
by

Christopher Himmelheber

on 29 March 2012

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Transcript of Evolution Introduction - Honors Biology

1795: James Hutton proposes gradualism
1798: Thomas Malthus publishes "Essay on the Principle of Population"
1809: Jean-Baptiste Lamarck publishes his hypothesis of evolution

1809: Darwin (and Abe Lincoln) born
1812: Georges Cuvier publishes studies of vertebrate fossils
1830: Charles Lyell publishes "Principles of Geology"
1831-1836: Darwin travels the world on
HMS Beagle
1844: Darwin writes his essay on descent with modification
1858: While studying species in the Malay Archipelago, Alfred Wallace sends Darwin his hypothesis of natural selection
1859: "On the Origin of Species by Means of Natural Selection" is published
History of Evolutionary Thought
How Evolution Works
2.
Variation
among individuals (observation)
3.
Competition
for Limited Resources (inference)
1.
Overproduction
of Offspring (Malthus)
5. Repeat every generation over millions of years (Lyell)..
4. Successful competitors survive, reproduce, & pass on their traits (observation)
No two are quite the same!
It's the "Struggle for Existence!"
FITNESS!!!
Most Babies won't grow up!
Introduction to Evolution
1844 - 1859 ?
Some Examples
Artificial Selection
Darwin provided many examples of "
artificial selection
"
Just like natural selection, but "fitness" is determined by human needs/wants.
Big changes can happen very fast.
"Endless forms most beautiful"
Evidence for Evolution
Ancient ideas about evolution:
Aristotle
Anaximander
Plato
The Modern Synthesis
Genetics + Evolution
Evidence for evolution comes from five major sources
Anatomy
Biochemistry
Embryology
Homologous Structures = Divergent Evolution
Analogous Structures = Convergent Evolution
Fossils
Eusthenopteron
Panderichthys
Tiktaalik
Acanthostega
Ichthyostega
Pederpes
The fossil record is fairly complete, with many transitional forms or "missing links"
DNA sequence and protein sequnce similarity
...& life will
adapt
to the environment
But...it's "Just a Theory" right??
Everything
is a theory
Theories must be
testable
and
falsifiable
Wild Mustard
Kohlrabi
Broccoli
Cabbage
Brussels Sprouts
Kale
Orchid Mantis
Leaf Mantis
Luc Viatour / www.Lucnix.be
Natural Selection
Peppered moth in England
Two coloration variants: light and dark
Industrial Revolution = Pollution
Saying "Just a Theory" indicates a fundamental lack of understanding of science
Biogeography
Environment is cleaned up
Full transcript