PRINCIPLES OF LIFE
PRINCIPLES OF LIFE
3rd Edition
ISBN: 9781319017712
Author: HILLIS
Publisher: MAC HIGHER
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Chapter 13, Problem 4.1Q

a.

Summary Introduction

To describe: The type of selection represented by the population with higher survival and reproduction of giraffes with longer necks compared with those with shorter necks.

Introduction: Natural selection of the population could be of three types- Stabilizing selection, directional selection, and disruptive selection.

b.

Summary Introduction

To describe: The type of selection represented by the population with higher survival and reproduction of cattle with intermediate calf weights compared with those with high or low calf weights.

Introduction: Natural selection is a driving force of evolution where stabilizing selection follows an evolutionary trend; directional favors one extreme and disruptive created variation.

c.

Summary Introduction

To describe: The type of selection represented by the population with higher survival and reproduction of grasshoppers with either small or large mouthparts, compared with those with intermediate-sized mouthparts.

Introduction: Natural selection favors the survival of the fittest. In an environment, a population could experience either of the three selection types- disruptive, stabilizing or directional.

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