FA2008 - BILD 3 - Lecture 07 (Speciation - 01)

FA2008 - BILD 3 - Lecture 07 (Speciation - 01) - Lecture 7...

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10/21/08 1 Lecture 7 Speciation “The mystery of mysteries…” Reading Text Ch. 24 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 A “speciescape” in which the size of the organism in proportional to the number of described species in the higher taxon it represents (Wheeler, 1990) II. What is a species? A. Biological species concept : group whose members have the potential to interbreed in nature and produce viable, fertile offspring The biological species concept is the “textbook” definition of a species. It is the definition used in
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