Biology: The Unity and Diversity of Life (MindTap Course List)
Biology: The Unity and Diversity of Life (MindTap Course List)
15th Edition
ISBN: 9781337408332
Author: Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher: Cengage Learning
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Chapter 17, Problem 1DAA
Summary Introduction

To determine: The town with most of the rats susceptible to warfarin.

Introduction: Rodenticides are the pesticides that have the capability to kill the whole rodent species. Rodents have their own importance in nature but sometimes require some control over their population, as they could transmit disease, destroy crops, and may cause ecological damage. Warfarin is a common anticoagulant that could be used as a rodenticide to kill mice and rats. After its discovery, warfarin has been widely used, and later, it resulted in the development of warfarin-resistant mice and rats.

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Answer to Problem 1DAA

Correct answer: The town with the most rats susceptible to warfarin was Town Lud.

Explanation of Solution

As given in the problem statement, researchers in the year 2000 tested the development of rodenticide resistance in wild rat populations among five towns (Town Olf, Town Sta, Town Dor, Town Lud, and Town Dre) of Germany. They used two rodenticides namely warfarin and recently developed bromadiolone. The obtained data as per the results shown in the Fig 17.6 are as follows:

  • In Town Olf, 58% of rat populations were resistant to both warfarin and bromadiolone. 21% of rats were resistant to warfarin alone, and equal percentages (21%) of rats were susceptible to warfarin or bromadiolone.
  • In Town Sta, 87% of rat populations were resistant to both warfarin and bromadiolone. 8% of rats were resistant to warfarin alone. Only 5% of the rats were susceptible to warfarin or bromadiolone.
  • In Town Dor, 56% of rats among the population were resistant to the rodenticide warfarin, and 44% of them were not susceptible to warfarin or bromadiolone.
  • In Town Lud, the whole populations of rat (100%) were susceptible to warfarin or bromadiolone.
  • In Town Dre, about 90% of rats were susceptible to warfarin or bromadiolone. Only 5% was resistant to both warfarin and bromadiolone, and 5% was resistant to warfarin alone.

From the given data, it can be concluded that in Town Lud, most of the rat populations were susceptible or not resistant to rodenticide (warfarin or bromadiolone).

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