Evolution
Evolution
4th Edition
ISBN: 9781605356051
Author: Douglas Futuyma, Mark Kirkpatrick
Publisher: SINAUER
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Chapter 12, Problem 1PDT
Summary Introduction

To determine: The reason that the evolution of alarm calls that are produced by many species of animals are favored by natural selection.

Introduction: The process of natural selection suggests that nature will favor the survival of the fittest among the species of a population. Individuals, who adapt in a way that they are able to face the external environmental conditions and can reproduce to ensure continuity of life on the Earth, will be selected by nature. Many species of animals adapt in various ways in order to get protection from their predators.

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Explanation of Solution

Many species of animals make alarm calls by which they can warn other members in their group about the predators. These organisms also attract the attention of approaching predators, making it more likely that the particular organism making the alarm call will be eaten. These alarm calls is favored by the natural selection because they permit the survival of organisms even in the presence of predators.

Alarm calls or signals promote the survival of organisms by allowing the receivers of alarms to escape from the source of the danger zone. Hence, such alarm calls are favored by the process of natural selection.

Summary Introduction

To determine: The way by which hypothesis of natural selection can be tested.

Introduction: Natural selection suggests that nature will favor the survival of the fittest among the species of a population. Individuals, who adapt in a way that they are able to face the external environmental conditions and can reproduce to ensure continuity of life on earth, will be selected by nature.

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Explanation of Solution

The hypothesis of evolution by natural selection was given by Charles Darwin. This hypothesis suggests that nature will preserve each and every useful variation. Any kind of biological variation either behavioral or physical will be stored by natural selection.

In this case, the hypothesis of natural selection can be tested by observing the evolution of different species of animals producing such defensive signals. These signals favor their survival and hence are conserved by nature.

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