05. Macroevolution - 1/15/2009 1 2 Macroevolution How do...

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1/15/2009 1 1 Macroevolution • How do new species come into existence? • How do evolutionary trends result in genera, families etc ? families, etc.? • How do complex structures come about? • Is anything “irreducibly complex?” 2 If humans descended from apes, why are there still apes? Apes and humans descended from populations of a more generalized ancestral species, and adapted to different niches By doing this, they avoided competition with each other and increased their chances of survival 3 The Okapi and the giraffe made a similar split, one staying in the forest, the other adapting to the savanna 4 Microevolutionary change (anagenesis) alone is not enough to create biological diversity Also required is Also required is cladogenesis 5 What is a species? Why are these not separate species? 6 How do these concepts of species differ from one another? • Phylogenetic species concept (traditional morphological concept) • Biological species concept • Evolutionary species concept (based on phylogenetic analysis) • Ecological species concept In what sense are they the same?
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1/15/2009 2 7 What ecological conditions promote the formation of new species? Allopatric speciation
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This note was uploaded on 02/10/2010 for the course BSC 2010 taught by Professor Essig during the Spring '10 term at University of Southern Maine.

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05. Macroevolution - 1/15/2009 1 2 Macroevolution How do...

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