Speciation - Speciation The process by which one species...

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Speciation 31/01/2008 17:35:00 The process by which one species splits into two What makes a species? o Different systems Morpholigy Several “different” organisms can be the same species Caterpillar/larva/Butterfly Phenotypic variations imitate different ‘species Similar organisms grown in different environments. Biological species Reproductive isolation Members of the same species can interbreed Different species cannot Most widely accepted o Not useful for fossils o Some organisms do not reproduce sexually How do new species arise? o Charles Darwin’s “On the origin of Species…” 1859 Excellent start but far from complete Biologists are still working on filling in the ‘holes’ o Anagenesis Change of a single lineage over time Artificial Fly bristle lab Natural o Cladogenesis (speciation) Splitting of one lineage into two
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This note was uploaded on 04/03/2008 for the course ECOL 182 taught by Professor Chesson during the Spring '08 term at University of Arizona- Tucson.

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Speciation - Speciation The process by which one species...

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