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ch 13 evolution

bio pearson campbell chapter 13
STUDY
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Genetic drift is _____.
more likely to have an impact on small populations
The evolution of populations due to chance is
genetic drift
Gene Flow
occurs when individuals move into or out of a population, changing the allele frequencies in the population. In this case, new brown beetles in the population cause the frequency of the brown allele to increase.
Natural Selection
occurs when organisms with one inherited trait survive and reproduce more than organisms with other traits.
Stabilizing selection
favors intermediate phenotypes, selecting against phenotypes at both ends of a range and reducing variation
Disruptive Selection
favors phenotypes at one end of a range and is common in periods of environmental change.
Directional Selection
favors phenotypes at one end of a range and is common in periods of environmental change
Sexual Dimorphism
individuals with certain inherited characteristics are more likely to obtain mates than other individuals.
Intrasexual Selection
males compete directly for mates
Mate choice
females choose the mate
Darwin described his broad theory of evolution as
descent with modification