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Biodiversity, Ancestry, & Rate of Evolution (15.3) State Standard SB5B. Explain the history of life in terms of biodiversity, ancestry, and the rates of evolution. Chapter 15 Evolution 15.3 Natural Selection-Speciation-Resistance Speciation Speciation is the formation of a new species. For speciation to occur a population must diverge and then be reproductively isolated. Chapter 15 Evolution 15.3 Natural Selection-Speciation-Resistance Adaptive Radiation – AKA Divergent Evolution/Speciation Can occur in a relatively short time when one species gives rise to many different species in response to the creation of new habitat or some other ecological opportunity Chapter 15 Evolution 15.3 Natural Selection-Speciation-Resistance Convergent Evolution Unrelated species evolve similar traits because of similar environmental pressures. Chapter 15 Evolution 15.3 Natural Selection-SpeciationResistance Coevolution The relationship between two species might be so close that the evolution of one species affects the evolution of the other species. Associated with mutualism Chapter 15 Evolution 15.3 Natural Selection-Speciation-Resistance Rate of Speciation Evolution proceeds in small, gradual steps according to a theory called gradualism. Punctuated equilibrium explains rapid spurts of genetic change causing species to diverge quickly. Chapter 15 Evolution 15.3 Natural Selection-Speciation-Resistance Chapter 15 Evolution 15.3 Formative Questions Which evolutionary pattern is represented by the similarities between these two organisms that live on separate continents? 0% B A 0% A B C D 0% 0% D 1. 2. 3. 4. C A. coevolution B. convergent evolution C. directional evolution D. divergent evolution Chapter 15 Evolution Chapter Assessment Questions The divergent evolution of these cichlid fish is an example of what type of speciation? 0% B A 0% A B C D 0% 0% D 1. 2. 3. 4. C A. coevolution B. mutation C. adaptive radiation D. convergent evolution Chapter 15 Evolution Chapter Assessment Questions What tempo of evolution does this model represent? 0% B A 0% A B C D 0% 0% D 1. 2. 3. 4. C A. gradual B. elevated C. sequential D. punctuated