Bio 180 Lecture 07:01

10 courtship and other predators hypotheses rejected

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Unformatted text preview: rtship and Other-predators hypotheses: Rejected Sheep-in-wolf’s-clothing hypothesis: Supported U) U) C 0 0. U) Spiders avoided flies with wing markings and wing waving 0 20 I a) 0. Cl) 0 0 g ’s rk Housefly w/Zono wings Untreated housefly 10 0 C (I) 0 FIGURE 1.11 Experimental Evidence That Waving Marked Wings Deters Jumping Spiders Researchers used Zonosemata flies and houseflies to create five treatment groups. Each group tested a dif ferent proposition about wing-waving display. Experimental results are presented as a type of graph, called a histogram. In this case, the histograms show how jumping spiders responded to the 20 flies in each treatment group. QUESTION The biologists who did this work claim that these data support the hypothesis that both wing markings and wing waving are essential to successful mimicry. Do you agree? Why or why not? What would you measure? What Is A Scientific Theory? A theory = a proposed explanation for a very broad class of phenomena or observations How does the terms theory differ from its use in everyday English? The word "the...
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