BROOKER BIOLOGY
BROOKER BIOLOGY
5th Edition
ISBN: 9781307656152
Author: BROOKER
Publisher: MCG/CREATE
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Chapter 23.2, Problem 1CC
Summary Introduction

To determine: The way in which directional selection affects genetic diversity in a population of mice on an island over the short run.

Introduction: Directional selection can be defined as a type of natural selection which favors an extreme phenotype over other phenotypes. It shifts frequency of allele in the direction of extreme phenotype over the time.

Summary Introduction

To determine: The way in which directional selection affects genetic diversity in a population of mice on an island over the long run.

Introduction: Directional selection can be defined as a type of natural selection which favors an extreme phenotype over other phenotypes. It shifts frequency of allele in the direction of extreme phenotype over the time.

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frequency of adaptive heritable traits in a population changes as REQUIREMENTS FOR NATURAL SELECTION TO OCCUR: 17a. Assuming that both types of pom-poms are present in the population, what do you think would happen to the pom-pom population if the black forest experienced a prolonged drought so all the trees died and the habitat became red grassland? 17b. Next, think about an alternative scenario. Suppose that natural selection over many generations had eliminated all the red pom-poms in the black forest habitat so only black pom- poms survived. After that, a prolonged drought resulted in this habitat turning into a red grassland. Would natural selection for pom-pom color occur? Why or why not? 17c. The above scenarios are showing that in order for natural selection to occur must exist within a trait.
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