Speciation

Speciation - 10/20/09 Lecture 7 Speciation Reading Text Ch....

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1 Lecture 7 Speciation Reading Text Ch. 24 Speciation: the divergence of a lineage to create new species “The mystery of mysteries” How are adaptation and speciation different? Why does life come in discrete units? Overview I. How many species are there? II. What is a species? A. Biological species concept 1. How does reproductive isolation occur? a. Prezygotic barriers b. Postzygotic barriers 2. Problems with the biological species concept B. Morphospecies concept C. Phylogenetic species concept III. How do species arise? A. Allopatric speciation 1. Vicariance 2. Dispersal B. Sympatric speciation 1. habitat differentiation 2. polyploidy in plants IV. Is reproductive isolation a byproduct or an adaptation? I. How many species are there? 1.8 million named 20 - 100 million suspected II. What is a species? A. Biological species concept : group whose members have the potential to interbreed in nature and produce viable, fertile offspring What unites a species? Gene flow
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This note was uploaded on 12/02/2009 for the course BILD BILD 3 taught by Professor Woodruff during the Fall '08 term at UCSD.

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Speciation - 10/20/09 Lecture 7 Speciation Reading Text Ch....

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