Lecture: Sept 30th - Oct 2nd
Lecture: Sept 30th - Oct 2nd Biol 180
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This 5 page Class Notes was uploaded by Arielle Menn on Sunday October 11, 2015. The Class Notes belongs to Biol 180 at University of Washington taught by Scott Rider Freeman in Summer 2015. Since its upload, it has received 72 views. For similar materials see Introductory Biology in Biology at University of Washington.
Reviews for Lecture: Sept 30th - Oct 2nd
Eugh...this class is soo hard! I'm so glad that you'll be posting notes for this class
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Date Created: 10/11/15
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15 135 PM Housekeeping 0 We are starting clickers today o If you think your clickers don39t work come up after class and make sure 0 Check scores online to make sure they39re working 0 Usually we don39t have lectures on Fridays because we39re taking our practice exams or real exams at this time 0 Kane 130 is still booked and available if you want to come in and take your practice exam here but they are online and you can take them anywhere with WiFi Evidence of Evolution 0 The ladder of evolution is a classic image but is it correct Hint no 0 Side note we will be doing a lot of individual and group experimental design in lecture 0 We want to focus on large sample size randomization etc to homogenize the average values for as many controlled variables as possible 0 So how do we go about testing evolution How do we gather experimental evidence 0 Every biology textbook funded by the govt has a disclaimer that evolution is a controversial theory that should not be treated as fact which is technically not false but the word theory is inaccurate because it39s using the vernacular everyday use of the word instead of the scientific use of the word 0 Evolution is more of a hypothesis than a theory 0 So what is a scientific theory 0 A theory is a bundle of hypotheses that describes or explains a larger system 0 Most theories have a pattern and a process component I Pattern what39s happening I Process howwhy is it happening 0 Let39s look at some other theories that aren39t evolution starting with special creation 0 Pattern component species are unchanging unrelated and perfectly suited to their environments 0 Process component species were created as they are now by a higher power or deity quot6000 years ago 0 Can this process be tested What kind of evidence would you look for while trying to support the null hypothesis I Evidence that species are unchanging I Evidence of extinction I Evidence of that one point of creation when species appeared 0 We can try to find this evidence based on the concept of uniformitarianism which states that the way the world works now is basically the same way it worked in the past so we can use things like soil erosion to date fossils I Eg If we find a fossil that exists only in olderdeeper layers but no fossils are found in fresher soil we39ve found evidence of extinction 0 We can also find evidence that species are not distributed uniformlyrandomly but that they are adapted to the specific environment in which they are found 0 When we find animals that are similar genetically we find homology or homologous species or traits I When we find traits between species that serve the same function but don39t have the same origin we39ve found homoplasy or analogous traits o What about a different type of evolution Lamarckian evolution 0 Pattern component Species get larger and more complex over time progressively they climb up the Ladder of Evolution 0 Process component Individuals adopt traits throughout their lifetimes that are more advantageous to their survival and pass those traits down to their offspring Biology 180 Page 1
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