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Lec_2_F06_st

Lec_2_F06_st - Observations Biodiversity For early...

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1 Observations Biodiversity For early scientists there were many questions about the natural world From very early on there were depictions of animals, and stories about how those animals influenced others At the level of biodiversity there was an effort to name every living thing
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2 History • Aristotle Bauhin(s) (1510-1620) Ray (1627-1705) Linnaeus (1707-1778) – Binomial System of Nomenclature – Each species is given its own unique name Hierarchy of naming organisms Inclusive Exclusive
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3 A matter of perspective Understanding how scientists ask questions and the reasons for those questions Looking a little bit closer
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4 Why does perspective matter? Do you see the same thing that the person next to you sees? Kermode Bears Spirit Bears of the Great Bear Rainforest
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5 Color morphs in black bears Single aa replacement in the MC1-R gene. This is part of a G- coupled protein receptor 7 pass structure through the membrane. Conformational change in the protein causes a change at the C-terminus, and a change in the binding site where GDP is replaced with GTP The result is a lack of deposition of color This is a photo of…?
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6 The Frog Experiment Was water pollution causing this? What to do with a hypothesis… Test and retest…
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7 Comparative Experiments Controlled Experiments Independent variable vs. Dependent variable Manipulated variable vs. Measured response Riberoia requires 3 hosts
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8 Power of Science Scientific explanations are important and valid because: hypotheses are testable hypotheses can be rejected by direct observation and experiments Are chiles too hot to disperse? Directed dispersal hypothesis
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9 Evolution and Natural Selection Darwin Natural Selection Patterns Evidence
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10 Darwin’s Idea Evolution by Natural Selection Why was this theory so controversial?
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