Paradise, Christopher J.,

Mechanisms of evolution / Christopher J. Paradise, A. Malcolm Campbell. - 1 online resource (47 pages) : illustrations. - Biology collection. . - Biology collection. .


Includes bibliographical references and index.

1. Selection acts on individuals with variable characteristics -- Selection can act on behaviors -- Natural selection on a discrete trait -- 2. Species may evolve in response to climate change -- Range expansion -- Evolutionary response to changing rainfall -- Ethical, legal, social implications: data are needed to formulate policy, but science is often misused in the process -- 3. Two seemingly isolated populations may not actually be isolated -- Some populations have limited dispersal -- Dispersal links geographic and genetic distance -- 4. Populations can evolve in the absence of natural selection -- Population isolation affects genetic diversity -- A population bottleneck reduces genetic diversity -- Conclusion -- Glossary -- Index.

Restricted to libraries which purchase an unrestricted PDF download via an IP.

YE2019 M08

Three of the four major mechanisms of evolution, natural selection, genetic drift, and gene flow are examined. There are 5 tenets of natural selection that influence individual organisms: Individuals within populations are variable, that variation is heritable, organisms differ in their ability to survive and reproduce, more individuals are produced in a generation than can survive, and survival & reproduction of those variable individuals are non-random. Organisms respond evolutionarily to changes in their environment and other selection pressures, including global climate change. The importance of spatial structure of a population in relation to how it affects the strength of gene flow and/or genetic drift, as well as the genetic variation and evolution of populations, is shown. Gene flow tends to reduce variation between populations and increase it within populations, whereas genetic drift tends to reduce genetic variation, especially in small, isolated populations. The mechanisms of evolution can lead to speciation, which requires both time and genetic isolation of populations, in addition to natural selection or genetic drift.

Mode of access: World Wide Web.
System requirements: Adobe Acrobat reader.


Natural selection.
Gene flow.

evolution population gene flow genetic drift adaptation natural selection phenotypes behavior predation selective agent heterozygous homozygous heritability dispersal genotype genetic isolation genetic distance non-adaptive evolution population bottleneck inbreeding

QH366.2 / .P274 2016