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Transcript
Charles Darwin (1809-1882)
Sailed around the world 1831-1836
What did
Darwin’s
Travels reveal
 The diversity of living
species was far greater
than anyone had
previously known!!
 These observations led
him to develop the
theory of evolution!!
How did tortoises and birds
differ among the islands of
the Galapagos?
 Each island
had its own
type of
tortoises
and birds
that were
clearly
different
from other
islands
Galapagos
Turtles
Darwin’s Famous Book
 On the Origin of
Species by Means
of Natural
Selection
 published in 1859
VOCABULARY REVIEW
 EVOLUTION – CHANGE OVER TIME
 NATURAL SELECTION - INDIVIDUALS
BETTER ADAPTED TO THE
ENVIRONMENT ARE ABLE TO
SURVIVE & REPRODUCE.
 A.K.A. “SURVIVAL OF THE FITTEST”
Natural Selection
 The traits that
help an organism
survive in a
particular
environment are
“selected” in
natural selection
What would be
another example of
natural selection?
How natural selection works
Resistance to antibacterial soap
Generation 1: 1.00 not resistant
0.00 resistant
How natural selection works
Resistance to antibacterial soap
Generation 1: 1.00 not resistant
0.00 resistant
How natural selection works
Resistance to antibacterial soap
Generation 1: 1.00 not resistant
0.00 resistant
Generation 2: 0.96 not resistant
0.04 resistant
mutation!
How natural selection works
Resistance to antibacterial soap
Generation 1: 1.00 not resistant
0.00 resistant
Generation 2: 0.96 not resistant
0.04 resistant
Generation 3: 0.76 not resistant
0.24 resistant
How natural selection works
Resistance to antibacterial soap
Generation 1: 1.00 not resistant
0.00 resistant
Generation 2: 0.96 not resistant
0.04 resistant
Generation 3: 0.76 not resistant
0.24 resistant
Generation 4: 0.12 not resistant
0.88 resistant
Natural Selection and
Species Fitness
 Overtime, natural selection results in
changes in the inherited
characteristics of a population.
 These changes increase a species
fitness (survival rate)
Summary of Darwin’s Theory
1. Organisms differ; variation is inherited
2. Organisms produce more offspring than
survive
3. Organisms compete for resources
4. Organisms with advantages survive to pass
those advantages to their children
5. Species alive today are descended with
modifications from common ancestors