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The History of Life The History of Life Section 17–4 Patterns of Evolution This section describes six important patterns of large-scale, long-term evolutionary.

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Presentation on theme: "The History of Life The History of Life Section 17–4 Patterns of Evolution This section describes six important patterns of large-scale, long-term evolutionary."— Presentation transcript:

1 The History of Life The History of Life Section 17–4 Patterns of Evolution This section describes six important patterns of large-scale, long-term evolutionary change. This section describes six important patterns of large-scale, long-term evolutionary change.

2 Introduction The large-scale evolutionary changes that take place over long periods of time are referred to as _______. The large-scale evolutionary changes that take place over long periods of time are referred to as _______. macroevolution macroevolution

3 Complete the concept map.

4 Extinction What are possible causes of mass extinctions? What are possible causes of mass extinctions? Possible causes include a huge asteroid striking Earth, many large volcanoes erupting, continents changing position, and sea levels changing. Possible causes include a huge asteroid striking Earth, many large volcanoes erupting, continents changing position, and sea levels changing.

5 What effects have mass extinctions had on the history of life? What effects have mass extinctions had on the history of life? The disappearance of so many species left habitats open. Often, the result was a burst of evolution that produced many new species. The disappearance of so many species left habitats open. Often, the result was a burst of evolution that produced many new species.

6 Adaptive Radiation The process of a single species or a small group of species evolving into diverse forms that live in different ways is called_____. The process of a single species or a small group of species evolving into diverse forms that live in different ways is called_____. adaptive radiation adaptive radiation

7 Adaptive Radiation What led to the adaptive radiation of mammals? The disappearance of the dinosaurs led to the adaptive radiation of mammals. The disappearance of the dinosaurs led to the adaptive radiation of mammals.

8 Convergent Evolution The process by which unrelated organisms come to resemble one another is called ________. The process by which unrelated organisms come to resemble one another is called ________. convergent evolution convergent evolution

9 Convergent Evolution Circle the letter of each choice that is an example of convergent evolution. Circle the letter of each choice that is an example of convergent evolution. b.Shark’s fin and dolphin’s limb b.Shark’s fin and dolphin’s limb

10 Coevolution The process by which two species evolve in response to changes in each other over time is called coevolution. The process by which two species evolve in response to changes in each other over time is called coevolution.

11 Coevolution How have plants and plant-eating insects coevolved? How have plants and plant-eating insects coevolved? Plants have evolved poisons to prevent insects from feeding on them. Insects, in turn, have evolved ways of inactivating or eliminating the poisons. Plants have evolved poisons to prevent insects from feeding on them. Insects, in turn, have evolved ways of inactivating or eliminating the poisons.

12 Punctuated Equilibrium The idea that evolution occurs at a slow, steady rate is called_____. The idea that evolution occurs at a slow, steady rate is called_____. gradualism gradualism

13 Punctuated Equilibrium What are some reasons rapid evolution may occur after long periods of equilibrium? What are some reasons rapid evolution may occur after long periods of equilibrium? It may occur when a small population becomes isolated or a small group migrates to a new environment. It may also occur following a mass extinction. It may occur when a small population becomes isolated or a small group migrates to a new environment. It may also occur following a mass extinction.

14 Punctuated Equilibrium The pattern of long, stable periods interrupted by brief periods of more rapid change is called _______. The pattern of long, stable periods interrupted by brief periods of more rapid change is called _______. punctuated equilibrium

15 Punctuated Equilibrium Is the following sentence true or false? Evolution has often proceeded at different rates for different organisms. TRUE

16 Developmental Genes and Body Plans How can hox genes help reveal how evolution occurred? How can hox genes help reveal how evolution occurred? Homologous hox genes establish body plans in animals that have not shared a common ancestor in hundreds of millions of years. In addition, major evolutionary changes may be based on hox genes.

17 Developmental Genes and Body Plans Is the following sentence true or false? Changes in the timing of genetic control during embryonic development can contribute to the variation involved in natural selection. Changes in the timing of genetic control during embryonic development can contribute to the variation involved in natural selection.true


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