Evolution and Selection Teacher Guide

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School

University of South Florida *

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3312

Subject

Biology

Date

Feb 20, 2024

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pdf

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1

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Evolution and Selection What mechanisms lead to changes in the diversity of species on Earth? Why? People make choices by selecting options they like best. The natural world also “selects” (although not as a conscious decision) when environmental conditions allow organisms with a particular genetic trait to live healthier lives than other organisms. In this activity, we will explore how selection affects populations over time. Model 1 — Desktop Swab Results T, I R, E. coli bacterial variants from culture Variant P Variant Q &2 Variant R &9 Varient S E. coli culture from swab of desktop E. coli colonies on E. coli colonies on growth medium growth medium without triclosan with triclosan 1. 'What is the source of the bacteria in the culture tube in Model 1? The bacteria came from swabbing a desktop. 2. How many genetic variants of E.coli were present in the culture from the initial swab? Four. 3. What variants of E.coli are found on the dish grown without triclosan? Variants B Q, R, and S are present on the dish that does not include triclosan. 4. Refer to the dish in Model 1 with the medium that included triclosan. a. What variants of E.coli are found on the dish grown with triclosan? The only variant present is S. 6. What likely happened to the other variants of E.cols on the dish with the medium containing triclosan? They were killed by the triclosan. Evolution and Selection This document is available free of charge on Q stUdocu Downloaded by Rudra Patel (11patelrudra@gmail.com) 163
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