Study Guide for Campbell Biology
Study Guide for Campbell Biology
11th Edition
ISBN: 9780134443775
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece, Martha R. Taylor, Michael A. Pollock
Publisher: PEARSON
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Chapter 24, Problem 12TYK
Summary Introduction

Introduction: Speciation is an evolutionary process by which the lineages split into new or distinct species. The species in reproductive isolation impedes the members of both species from interbreeding with the species that produce fertile offspring. These barriers stop the gene flow between species, and thus limit the formation of hybrids. Such barriers can be classified into two types, namely pre-zygotic and post zygotic.

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Which of the following is an example of postzygotic reproductive isolation?a. Sperm of species A dies in the oviduct of species B before fertilization can take place.b. Hybrid zygotes between species A and B are spontaneously aborted early indevelopment.c. The mating seasons of species A and B do not overlap.d. Males of species A are not attracted to the pheromones produced by the females ofspecies B.
Hybridization between incompletely isolated populations a. always leads to reinforcement due to the inferiority of hybrids. b. can serve as a mechanism for preserving gene flow between populations, thus preventing speciation. c. only occurs in plants. d. never affects rates of speciation.
Assume you are studying two species of lizard that occur in sympatry. In allopatry, Lizard Species A is dark brown but in sympatry is black in color. In allopatry, Lizard Species B is brown but in sympatry is light brown. This example is best described as which of the following?   a. Postzygotic Isolation   b. Character displacement   c. Sympatric speciation   d. Genetic incompatibility   e. Hybridization
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