Biology: The Dynamic Science (MindTap Course List)
Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN: 9781305389892
Author: Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher: Cengage Learning
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Chapter 21, Problem 3TYK
Summary Introduction

Introduction:

Balanced polymorphism is a part of the natural selection method where characters of two alleles are maintained in a constant proportion over many generations. The phenotypic traits of both the alleles are dominant and expressed.

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What type of selection is representative of what would happen if the earth were to continually cool, and some bears, such as those with thin or no hair, moved south and other bears with very thick fur stayed up the north. In this type of selection event, both types of bears would be selected for. (a)disruptive selection (b)directional selection (c)stabilizing selection (d)sexual selection
Within a particular population, darkly colored rats are more likely to survive than more lightly colored individuals. This situation is likely to result in a. directional selection. b. stabilizing selection. c. disruptive selection. d. balancing selection.
When male lions reach sexual maturity, they leave their group in search of a new pride. This can alter the allele frequencies of the population through which of the following mechanisms? a. natural selection b. genetic drift c. gene flow d. random mating
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