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speciation to post 2

speciation to post 2 - Speciation Populations of organisms...

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10/1/2013 1 Speciation Populations of organisms and their cellular components have changed over time through both selective and non Ͳ selective evolutionary forces (Evolution) Speciation depends on isolating populations, which can be geographic or environmental Evolution can cause divergence in those populations Species concepts are critical to knowing whether speciation has occurred! Three Steps to Speciation ( Macroevolution ) 1. Genetic Isolation 2. Genetic Divergence 3. Designated “New Species” if… don’t breed together anymore (“reproductively isolated” – called the biological species concept) OR look different (morphology – called the morphospecies concept) OR are genetically different (form a monophyletic group – called the phylogenetic species concept)
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10/1/2013 2 Phylogeny – represents the “family tree” of a group “Bison” is a monophyletic group – one branch on a phylogenetic tree Bison has subspecies (not shown on tree): Plains bison Wood bison
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