Evolution and selection worksheet biology 2015 UCHS -...

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Nature of Mathematics
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Chapter 6 / Exercise 58
Nature of Mathematics
Smith
Expert Verified
Evolution and SelectionWhat mechanisms lead to changes in the diversity of species on Earth?Why?
Model 1 – Desktop Swab Resultswithout triclosanwith triclosan1.What is the source of the bacteria in the culture tube in Model 1?
2.How many genetic variants of E.coliwere present in the culture from the initial swab?
3.What variants of E.coliare found on the dish grown without triclosan?
4.Refer to the dish in Model 1 with the medium that included triclosan.Evolution and Selection 1
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Nature of Mathematics
The document you are viewing contains questions related to this textbook.
Chapter 6 / Exercise 58
Nature of Mathematics
Smith
Expert Verified
a.What variants of E.coliare found on the dish grown with triclosan?
b.What likely happened to the other variants of E.colion the dish with the medium containing triclosan?
5.Based on its effect on E.coli,why is triclosan used as a cleaning agent?
6.Suppose the desktop swabbed earlier was cleaned with a solution containing triclosan. Would living E.coliremain? Support your answer.
7.Suppose the desktop was swabbed again after cleaning it with triclosan over a 9-month school year. When the sample was cultured only variant S was seen.a.What characteristic does the variant S bacteria have that allows it to remain on the desktop even after several months of treatment with triclosan?

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