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CHapter 15 Notes - B iology 1421 Chapter 15 Key Terms A...

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Biology 1421 Chapter 15 Key Terms Adaptation: a trait that increases the ability of an individual to survive and reproduce compared to individuals without a trait. Allele Frequency: for any given gene, the relative proportion of each allele of that gene in a population. Coevolution: the evolution of adaptations in two species due to their extensive interactions with one another, such that each species acts as a major force for natural selection on the other. Competition: interaction among individuals who attempt to utilize resources that is limited relative to the demand for it. Directional Selection: a type of natural selection in which one extreme phenotype is favored over all others. Disruptive Selection: a type of natural selection in which both extremes phenotypes are favored over the average phenotype. Equilibrium Population: a population in which allele frequencies and the distribution of genotypes do not change from generation to generation.
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