Lecture 3 The Darwinian Revolution
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1 Lecture 3 The Darwinian Revolution
2 Theories of evolution first developed by the Greek philosophers.
3 Theories of evolution first developed by the Greek philosophers. Anaximander ( BC) wrote about the sudden appearance of humans from fishlike creatures.
4 Is this evolution?
5 Is this evolution? NO! It is spontaneous generation!
6 Two characteristics of spontaneous generation were common to early Greek philosophers:
7 Two characteristics of spontaneous generation were common to early Greek philosophers: 1. Resulted from the generative powers of nature (i.e., not actions of a God).
8 Two characteristics of spontaneous generation were common to early Greek philosophers: 1. Resulted from the generative powers of nature (i.e., not actions of a God). 2. Were nonteleological (i.e., without an underlying design or goal).
9 The influence of Aristotle ( BC) Plato and Aristotle
10 The influence of Aristotle ( BC) 1. All species are fixed and eternal
11 The influence of Aristotle ( BC) 1. All species are fixed and eternal evolution not possible!
12 The influence of Aristotle ( BC) 2. The philosophy of essentialism
13 The influence of Aristotle ( BC) 2. The philosophy of essentialism each species represented by its eidos
14 The influence of Aristotle ( BC) 2. The philosophy of essentialism each species represented by its eidos variation among individuals of a species is not real, nor important.
15 The influence of Aristotle ( BC) 3. The scala naturae or great chain of being
16 The influence of Aristotle ( BC) 3. The scala naturae or great chain of being refers to a linear progression of organisms from most simple to most complex.
17 The influence of Aristotle ( BC) 3. The scala naturae or great chain of being refers to a linear progression of organisms from most simple to most complex. over time, believed to reflect the actions of a creator.
18 A 1579 drawing of the scala naturae
19 The chain of being, from Charles Bonnet Œuvres d'histoire naturelle et de philosophie, )
20 How did evolutionary thinking develop?
21 How did evolutionary thinking develop? 1. The scientific revolution
22 How did evolutionary thinking develop? 1. The scientific revolution Astronomy earth not the center of the universe!
23 How did evolutionary thinking develop? 1. The scientific revolution Astronomy earth not the center of the universe! Geology evidence for great age of earth, study of fossils
24 How did evolutionary thinking develop? 1. The scientific revolution Astronomy earth not the center of the universe! Geology evidence for great age of earth, study of fossils 2. The discovery of new faunas
25 How did evolutionary thinking develop? 1. The scientific revolution Astronomy earth not the center of the universe! Geology evidence for great age of earth, study of fossils 2. The discovery of new faunas 3. Extinction
26 How did evolutionary thinking develop? 4. The microscope
27 How did evolutionary thinking develop? 4. The microscope provided support for spontaneous generation.
28 How did evolutionary thinking develop? 4. The microscope provided support for spontaneous generation. 5. Development of the science of systematics
29 How did evolutionary thinking develop? 4. The microscope provided support for spontaneous generation. 5. Development of the science of systematics undermined the scala naturae.
30 Evolution according to Lamarck ( )
31 Evolution according to Lamarck ( ) Recognized two causes of evolutionary change:
32 Evolution according to Lamarck ( ) Recognized two causes of evolutionary change: 1. Life has an innate potential to acquire greater and greater complexity.
33 Evolution according to Lamarck ( ) Recognized two causes of evolutionary change: 1. Life has an innate potential to acquire greater and greater complexity. - now called orthogenesis.
34 Recognized two causes of evolutionary change: 2. Organisms reacted to their environments and changed form.
35 Recognized two causes of evolutionary change: 2. Organisms reacted to their environments and changed form. changes were then transmitted to subsequent generations.
36 Recognized two causes of evolutionary change: 2. Organisms reacted to their environments and changed form. changes were then transmitted to subsequent generations. now called the inheritance of acquired characteristics or soft inheritance.
37 The science of epigenetics
38 Lamarck s theory of organic progression
39 Charles Darwin Alfred Russell Wallace
40 Thomas Robert Malthus ( )
41
42 Evolution according to Charles Darwin ( )
43 Evolution according to Charles Darwin ( ) - publication of On the origin of species by means of natural selection or the preservation of favored races in the struggle for life ( The origin ) occurred in 1859.
44 Darwin had two main objectives in writing this book
45 Darwin s objectives: 1. To make the case that evolution had occurred.
46 Darwin s objectives: 1. To make the case that evolution had occurred. 2. To provide a mechanism for how evolutionary change occurs.
47 Alfred Russell Wallace and the Ternate paper
48 Darwin s Five Theories
49 Darwin s Five Theories 1. Evolution per se
50 Darwin s Five Theories 1. Evolution per se the world is steadily changing and populations of organisms are transformed over time.
51 Darwin s Five Theories 1. Evolution per se the world is steadily changing and populations of organisms are transformed over time. 2. Common descent
52 Darwin s Five Theories 1. Evolution per se the world is steadily changing and populations of organisms are transformed over time. 2. Common descent every group of organisms has descended from a common ancestor.
53 Darwin s Five Theories 1. Evolution per se the world is steadily changing and populations of organisms are transformed over time. 2. Common descent every group of organisms has descended from a common ancestor. all species can ultimately be traced to a single origin of life on earth.
54 Darwin s Five Theories 3. Multiplication of species
55 Darwin s Five Theories 3. Multiplication of species this process is now called speciation.
56 Darwin s Five Theories 3. Multiplication of species this process is now called speciation. Darwin s view similar to what is now called allopatric speciation.
57 Darwin s Five Theories 3. Multiplication of species this process is now called speciation. Darwin s view similar to what is now called allopatric speciation. 4. Gradualism
58 Darwin s Five Theories 3. Multiplication of species this process is now called speciation. Darwin s view similar to what is now called allopatric speciation. 4. Gradualism most evolutionary change occurs slowly.
59 Darwin s Five Theories 3. Multiplication of species this process is now called speciation. Darwin s view similar to what is now called allopatric speciation. 4. Gradualism most evolutionary change occurs slowly. 5. Natural selection
60 Darwin s Five Theories 3. Multiplication of species this process is now called speciation. Darwin s view similar to what is now called allopatric speciation. 4. Gradualism most evolutionary change occurs slowly. 5. Natural selection this was Darwin s mechanism for how evolutionary change occurred.
61 Similarities between Lamarck s and Darwin s theories
62 Similarities between Lamarck s and Darwin s theories 1. Lineages change over time - evolution occurs.
63 Similarities between Lamarck s and Darwin s theories 1. Lineages change over time - evolution occurs. 2. A continually changing world drives evolutionary change.
64 Similarities between Lamarck s and Darwin s theories 1. Lineages change over time - evolution occurs. 2. A continually changing world drives evolutionary change. 3. The rate of change is slow (gradualism).
65 Differences between Lamarck s and Darwin s Theories
66 Differences between Lamarck s and Darwin s Theories Lamarck Darwin Inheritance soft hard
67 Differences between Lamarck s and Darwin s Theories Lamarck Darwin Inheritance soft hard Extinction no yes
68 Differences between Lamarck s and Darwin s Theories Lamarck Darwin Inheritance soft hard Extinction no yes Orthogenesis yes no
69 Differences between Lamarck s and Darwin s Theories Lamarck Darwin Inheritance soft hard Extinction no yes Orthogenesis yes no Common descent no yes
70 Differences between Lamarck s and Darwin s Theories Lamarck Darwin Inheritance soft hard Extinction no yes Orthogenesis yes no Common descent no yes Speciation no yes
71 Differences between Lamarck s and Darwin s Theories Lamarck Darwin Inheritance soft hard Extinction no yes Orthogenesis yes no Common descent no yes Speciation no yes Role of environment creates sorts variation variation
72 The Darwinian Revolution
73 The Darwinian Revolution Darwin s theory challenged the prevailing beliefs of his day:
74 The Darwinian Revolution Darwin s theory challenged the prevailing beliefs of his day: 1. The belief in a constant world of limited age.
75 The Darwinian Revolution Darwin s theory challenged the prevailing beliefs of his day: 1. The belief in a constant world of limited age. 2. The belief in a world designed by a wise and benign creator.
76 The Darwinian Revolution Darwin s theory challenged the prevailing beliefs of his day: 1. The belief in a constant world of limited age. 2. The belief in a world designed by a wise and benign creator. 3. The belief in the immutability of species.
77 The Darwinian Revolution Darwin s theory challenged the prevailing beliefs of his day: 1. The belief in a constant world of limited age. 2. The belief in a world designed by a wise and benign creator. 3. The belief in the immutability of species. 4. The belief in the unique position of man in creation.
78 The Darwinian Revolution Darwin s theory challenged the prevailing beliefs of his day: 1. The belief in a constant world of limited age. 2. The belief in a world designed by a wise and benign creator. 3. The belief in the immutability of species. 4. The belief in the unique position of man in creation. 5. The belief in the philosophy of essentialism.
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