Human Biology Custom Edition
Human Biology Custom Edition
11th Edition
ISBN: 9781337631532
Author: Cecie Starr, Beverly McMillan
Publisher: Cengage Learning
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Chapter 23, Problem 1RQ
Summary Introduction

To distinguish: Microevolution and macroevolution.

Introduction: Evolution is a process that is governed by natural selection and is defined as the changes that accumulate in a species in the course of time. These changes are inherited in offspring.

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Explanation of Solution

The following table shows the difference between microevolution and macroevolution:

CriteriaMicroevolutionMacroevolution
DefinitionGene level changes in individual species.Gene level changes in multiple species.
LevelSpecies levelAll taxon levels
ScaleSmall-scaleLarge-scale
SpeciesWithin speciesBetween species
PeriodFew generationsLonger periods of time that span up to eras.
Factors

Mutation,

Selection,

Gene flow,

Genetic drift.

Extended microevolution
BasisMolecular levelFossil data
Occurs whenAlwaysHigh post mass extinction

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