Evolution. How Populations Evolve. Voyage of the Beagle. Jean Baptiste Lamarck. Charles Lyell. Artificial Selection. Artificial Selection. Natural Selection. Darwin saw natural selection as the basic mechanism of evolution
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How Populations Evolve
Thousands tomillions of yearsof natural selection
Chromosome with geneconferring resistanceto insecticide
Additionalapplications of thesame insecticide willbe less effective, andthe frequency ofresistant insects inthe populationwill grow
Gene pool in a different environmentsnonevolving population remains constant over generations.
Island of Krakotoa, 1883
0 scienceVARIATION AND NATURAL SELECTION
Figure 13.17B three ways
Sexual selection may produce sexual dimorphism