Transcript What evolution is…

What evolution is…
1
2
Lamarck
Jean-Baptiste Pierre Antoine de Monet, Chevalier de Lamarck
Published in 1809
“Evolution as Striving”
http://evolution.berkeley.edu/evosite/history/evol_happens.shtml
3
• Lamarck: Inheritance of acquired characters
4
• Lamarck: Populations change as individuals
change in response to environment
5
•Lamarck:
1) no relationships among living taxa
2) species diversity explained by repeated spontaneous generation
6
Slow death of the idea of Spontaneous
Generation—1668-1859
7
8
Lamarck:
As individuals
change in
response to the
environment,
populations
change over
time
Darwin:
Differential
reproductive
success
explains how
populations
change over
time
Natural Selection
9
• Lamarckian evolution had some problems…
• What did he get right?
10
Charles Darwin
• 2 great contributions
1) evolution by means of natural selection (mechanism)
2) species are related (common ancestry)
Born 1809 (year
Lamarck published)
Published “O of S”
when 50 years old!
(1859)
11
• Darwin: Populations change as individuals
experience different reproductive success
(based on environment)
Lamarck vs. Darwin:
Differential reproductive success is the main difference
12
Evolution by Means of Natural
Selection
13