Chapter 11 Section 3 OTHER MECHANISMS OF EVOLUTION

Bottleneck Effect
genetic drift that results from an event that drastically reduces the size of a population. (p. 336)

Founder Effect
genetic drift that occurs after a small number of individuals colonize a new area. (p. 336)

Gene Flow
physical movement of alleles from one population to another. (p. 335)

Genetic Drift
change in allele frequencies due to chance alone, occurring most commonly in small populations. (p. 336)

Sexual Selection
selection in which certain traits enhance mating success; traits are, therefore, passed on to offspring. (p. 338)

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