Transcript Natural Selection and Evidence for Evolution

Take 5: 12/2/11
► Explain
prove?
Redi’s experiment and what did it
► What
did Pasteur discover in his
experiments?
► What
is spontaneous generation?
Charles Darwin,
a naturalist
Ch 15.1
Excerpt from Evolutionary Dynamics
In 1831, at the age of
twenty-two, Charles Darwin
embarked on a his journey
around the world. He gazed
at the breath-taking diversity
of tropical flora and fauna,
collected creepy-crawlies in
Brazil, and witnessed
genocide in Argentina.
Excerpt from Evolutionary Dynamics
He experience the effects
of devastating earthquake
into Chile that raised the
South American Continent.
He led an expedition into
the Andes mountains and
discovered marine fossils at
high altitude.
Excerpt from Evolutionary Dynamics
He paid little attention to the which finches
came from which islands in the Galapagos
and ate most of the delicious turtles he had
gathered on his way home across the
Pacific…Darwin returned to England’s shores
after five years, having collected sixthousand specimens that would require
decades of analysis by an army of experts.
Darwin’s Voyage on the HMS Beagle
Darwin
► Darwin
spent the next 20 years sorting,
identifying and analyzing his data.
► Charles Darwin did not invent the concept
of evolution. When he was a student in
Edinburgh in the late 1820’s, evolution was
already the talk of the town.
► Darwin was also a keen observer of animal
breeders.
Darwin’s Pigeons
► Darwin
bred domestic pigeons.
► He also gained insight into the mechanism that
determines which organisms survive in nature.
Darwin’s Pigeons
► Darwin
observed that traits of individuals
vary in populations
► By
breeding pigeons with desirable traits,
Darwin produced offspring with these traits.
► Breeding
organisms with specific traits in
order to produce offspring with identical
traits is called
artificial selection.
Who was Charles Darwin?
Why is evolution controversial?
Cladogram