LIFE 102 Lecture Notes - Lecture 52: Genetic Drift, Allele Frequency, Gene Flow
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Some alleles are therefore more likely to be passed to the next generation. Natural selection is the only mechanism that consistently causes adaptive evolution. Describes how allele frequencies fluctuate unpredictable from one generation to the next. Tends to reduce genetic variation through losses of alleles. The smaller of a sample, the greater the chance of deviation from a predicted result. Occurs when a few individuals become isolated from a larger population. *allele frequencies in the small founder population can be different from those in the larger parent population. A sudden reduction in population size due to a change in the environment. The resulting gene pool may no longer be reflective of the original population"s gene pool. If the population remains small, it may be further affected by genetic drift. *loss of prairie habitat caused a severe reduction in the population of greater prairie chickens in illinois (don"t write)
