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Biology

Biology. 17-4 Patterns of Evolution. Macroevolution refers to large-scale evolutionary patterns and processes that occur over long periods of time. Macroevolution. Six important topics in macroevolution are: extinction adaptive radiation convergent evolution coevolution

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Biology

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  1. Biology Copyright Pearson Prentice Hall

  2. 17-4 Patterns of Evolution Macroevolution refers to large-scale evolutionary patterns and processes that occur over long periods of time. Copyright Pearson Prentice Hall

  3. Macroevolution Six important topics in macroevolution are: • extinction • adaptive radiation • convergent evolution • coevolution • punctuated equilibrium • changes in developmental genes Copyright Pearson Prentice Hall

  4. Extinction Extinction More than 99% of all species that have ever lived are now extinct. Copyright Pearson Prentice Hall

  5. Extinction What effects have mass extinctions had on the history of life? Mass extinctions have: • provided ecological opportunities for organisms that survived • resulted in bursts of evolution that produced many new species Copyright Pearson Prentice Hall

  6. Adaptive Radiation Adaptive Radiation Adaptive radiation is the process by which a single species or a small group of species evolves into several different forms that live in different ways. For example, in the adaptive radiation of Darwin's finches, more than a dozen species evolved from a single species. Copyright Pearson Prentice Hall

  7. Copyright Pearson Prentice Hall

  8. Adaptive Radiation Adaptive Radiation of Mammals Artiodactyls Cetaceans Perissodactyls Tubulidentates Hyracoids Sirenians Proboscideans Ancestral Mammals Copyright Pearson Prentice Hall

  9. Adaptive Radiation Copyright Pearson Prentice Hall

  10. Convergent Evolution Convergent Evolution Different organisms undergo adaptive radiation in different places or at different times but in similar environments. The process by which unrelated organisms come to resemble one another is called convergent evolution. Results in analogous structures. Copyright Pearson Prentice Hall

  11. Coevolution Coevolution Sometimes organisms that are closely connected to one another by ecological interactions evolve together. The process by which two species evolve in response to changes in each other over time is called coevolution. Copyright Pearson Prentice Hall

  12. Punctuated Equilibrium Punctuated Equilibrium Darwin felt that biological change was slow and steady, an idea known as gradualism. Copyright Pearson Prentice Hall

  13. Punctuated Equilibrium Punctuated equilibrium is a pattern of evolution in which long stable periods are interrupted by brief periods of more rapid change. Copyright Pearson Prentice Hall

  14. Developmental Genes and Body Plans Developmental Genes and Body Plans Hox Genes are the master control genes of body layout. Evolution of Wings in Insects Copyright Pearson Prentice Hall

  15. 17-4 Copyright Pearson Prentice Hall

  16. 17-4 Darwin's species of finches were very similar but different in beak size and feeding habits. This is an example of • convergent evolution. • coevolution. • adaptive radiation. • stabilizing selection. Copyright Pearson Prentice Hall

  17. 17-4 A slow steady change in a particular line of descent is called • coevolution. • gradualism. • punctuated equilibrium. • convergent evolution. Copyright Pearson Prentice Hall

  18. 17-4 Master control genes are called • hox genes. • developmental genes. • embryonic genes. • regulatory genes. Copyright Pearson Prentice Hall

  19. 17-4 Some evidence suggests that species do not change much over long periods of time and then undergo relatively short periods of rapid speciation. This kind of change is called • coevolution. • genetic equilibrium. • adaptive radiation. • punctuated equilibrium. Copyright Pearson Prentice Hall

  20. 17-4 Fossil evidence shows that mass extinctions • ended the existence of many species in a short period of time. • occurred mainly when the dinosaurs disappeared. • require an asteroid strike to occur. • caused convergent evolution among animals. Copyright Pearson Prentice Hall

  21. END OF SECTION

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