Microsoft PowerPoint - 311DChap24

Microsoft PowerPoint - 311DChap24 - Speciation Speciation...

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1 Speciation Speciation Speciation is the process by which daughter species evolve from a parent species Outline Outline c Key concepts c Biological species c Reproductive Isolating Mechanisms c Other concepts of species c Allopatric speciation c Sympatric speciation c Adaptive radiation c Key Terms c Conclusions Key Concepts: c A species consist of one or more populations of individuals that can interbreed and produce offspring c Populations of a species have a shared genetic history c Speciation is the process by which daughter species evolve from a parent species
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2 Key Concepts: c There are many different mechanisms to isolate species c Geographic barriers can start the process of speciation Allopatric speciation c With sympatric speciation, a species can form within the range of a parent species Biological Species Concept Biological Species Concept Defines a species as a population or group of populations whose members have the potential to interbreed in nature and produce viable, fertile offspring but are unable to produce viable fertile offspring with members of other populations Same species or not? Same species or not? Similarity between different species. The eastern meadowlark ( Sturnel a magna, left) and the western meadowlark ( Sturnel a neglecta, right) have similar body shapes and colorations. Nevertheless, they are distinct biological species because their songs and other behaviors are different enough to prevent interbreeding should they meet in the wild. (a)
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This note was uploaded on 05/06/2009 for the course BIO 311 taught by Professor Juliepalmer during the Spring '08 term at University of Texas at Austin.

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Microsoft PowerPoint - 311DChap24 - Speciation Speciation...

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