18.3 – Building the Tree of Life Chapter 18 – Classification 18.3 Building the Tree of Life.
Chapter 18.3
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Natural Selection Revisited AP Biology Spring 2011
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Chapter 18.3. Natural Selection Revisited. AP Biology Spring 2011. Natural Selection. Natural Selection may be the most influential microevolutionary process. Natural Selection. An allele that ensures better survival or reproduction will influence the frequency of that allele. - PowerPoint PPT Presentation
Transcript of Chapter 18.3
Natural Selection Revisited
AP BiologySpring 2011
Natural Selection may be the most influential microevolutionary process
An allele that ensures better survival or reproduction will influence the frequency of that allele
Allele frequency can depend on the organisms involved and the selection pressure
There are three major categories of selection:DirectionalStabilizing Disruptive
The next sections will outline each of these categories
