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SelectionThe Mechanism of Evolution$
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Graham Bell

Print publication date: 2007

Print ISBN-13: 9780198569725

Published to Oxford Scholarship Online: May 2008

DOI: 10.1093/acprof:oso/9780198569725.001.0001

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Artificial selection

Artificial selection

(p.186) CHAPTER 6 Artificial selection

Graham Bell

Oxford University Press

Artificial selection provides a means of validating evolutionary principles, and is the basis of applied evolutionary biology. This chapter describes both short-term and long-term responses to selection for defined phenotypic characteristics. The first section of this chapter, Selection acting on quantitative variation, describes inheritance of quantitative characters; stabilizing selection; directional selection of quantitative characters; and stabilizing selection of quantitative characters. The second section is called Generations 1-10, the short-term response, and talks about a bristle experiment; the short-term response; asymmetry; divergence; selection of heritable merit; the indirect response to selection; the tertiary theorem of natural selection; and stabilizing selection. The next section called Generations 10-100, the limits to selection, discusses surpassing the ancestor; the selection limit; heroic experiments; the limits to selection in terms of loss of useful variation; long-continued response in terms of recurrent mutation; long-continued response in terms of environmental variance; limits to selection in terms of countervailing natural selection; the limits to stabilizing selection; and transcending the limit. Finally, the section entitled Generations 100 up - new kinds of creatures, discusses selection for yield in crop plants; historical improvement; and domestication.

Keywords:   heritability, applied evolution, crop plants, domestication, asymmetry, divergence, selection limit, yield, long-term selection

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