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Evolution by Natural Selection: A Well-Tested Theory Evolution by Natural Selection: A Well-Tested Theory
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How Evolutionary Changes Occur: Definitions and Mechanisms How Evolutionary Changes Occur: Definitions and Mechanisms
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An Example of Evolution by Natural Selection An Example of Evolution by Natural Selection
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Complex Adaptations Evolve, with No Long-term Goal, in a Series of Steps Complex Adaptations Evolve, with No Long-term Goal, in a Series of Steps
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Evolution via Less-fit Intermediates Evolution via Less-fit Intermediates
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Natural Selection Has Had Plenty of Time to Work Natural Selection Has Had Plenty of Time to Work
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Perspective Perspective
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3 Evolution 101: The Power of Natural Selection
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Published:July 2012
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Abstract
This chapter considers some definitions and fundamental concepts of evolutionary biology, with a particular focus on the power of natural selection to improve the adaptation of individual plants and animals to their environment. It begins with a discussion of evolution by natural selection as a well-tested scientific theory, along with three conditions that must be met in the evolution of species by natural selection: first, there must be differences among individual members of the species; second, individuals must have some tendency to inherit the characteristics of their parents; and third, inherited differences must affect reproductive success. The chapter proceeds by assessing the implications of these changes within species for agriculture. It also gives an example of how populations evolve by natural selection and concludes with an analysis of the evolution of transfer RNA genes via less-fit intermediates.
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