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Lecture.1 - 0 NOTE These files are provided for the sole...

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0 NOTE!! These files are provided for the sole purpose of assisting BSci 110 students to study for exams in the class. Some of the material in these files may be copyrighted, and it is not OK for you to share these files with anyone who is not a student in this class or to use them for any purpose other than to study for the exams of our class. Thanks, Carl Johnson
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Section 01 (11:10 am): Dr. Terry Page Dr. Patrick Abbot Section 02 (10:10 am): Dr. Carl Johnson Dr. Denise Due-Goodwin 1 Biological Sciences 110-B
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“Nothing in biology makes sense except in the light of evolution” -T. Dobzhansky 2
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The Theory of Evolution by Natural Selection (in a nutshell) Fact # 1: Reproductive Rates of all organisms are sufficiently high that populations would quickly become enormous if mortality rates did not balance reproductive rates. Fact # 2: All Organisms are Variable and offspring are similar to their parents because they inherit their parent’s features. Conclusion/Theory : the differences among individuals influence how well those individuals survive and reproduce. Traits that increase the probability that their bearers will reproduce successfully are more likely to be passed on to their offspring and to subsequent generations. 3
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Evidence in support of the theory of evolution Fossil record Artificial selection Phylogenetic similarities 4
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Fossil Record 1. Progression of forms a) gradualism (rate of evolution has been constant) b) “gaps?” c) punctuated equilibrium Time Change in Forms gradualism 5
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Fossil Record 1. Progression of forms a) gradualism b) “gaps?” c) punctuated equilibrium Time Change in Forms “gaps in the fossil record?” 6
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Fossil Record 1. Progression of forms a) gradualism b) “gaps?” c) punctuated equilibrium Time Change in Forms punctuated equilibrium 7
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Fossil Record 1. Progression of forms a) gradualism b) “gaps?” c) punctuated equilibrium: Adaptive Radiations new adaptations can exploit new niches 8
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Fossil Record 9 1. Progression of forms a) gradualism b) “gaps?” c) punctuated equilibrium 2. Dating methods for example, 14 Carbon dating of sediments (see C&R p. 517)
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