BIOL 121 Lecture 17: 2010.03.15 - Evolution - Allele Frequencies in Populations (Chapter 25).docx

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BIOL 121 Full Course Notes
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A population is a group of individuals from the same species that live in the same area at the same time (and interbreed) Measurement of changes in a population over time = evolution. Natural selection is not the only agent responsible for evol. Each of these four processes have diff consequences. Natural selection is the only mechanism that acting alone can result in adaptation. The other three (mutation, gene flow, drift) do not favour certain alleles over others. Mutation and drift introduce a nonadaptive component into evol. A. tenuis is a plant species and some of its individuals can grow on heavy metals such as in an abandoned mine site in wales the population has adapted and evolution has occurred. Therefore, a change in allele frequency has occurred. All the gametes of a single generation in a population. Agrostis tenuis growing on heavy metals on an abandoned mine in.

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