VUBio110BSp'08-Speciation 13-POST

VUBio110BSp'08-Speciation 13-POST - Allopolyploidy Ex....

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Mechanisms of reproductive isolation reducing gene flow between populations Allopatric speciation (= other homeland) geographic isolation in situ separation (water, mountain-building, etc.) long-distance dispersal Followed by genetic drift and local selection Outstanding examples – adaptive radiation e.g., Darwin’s finches, Hawaiian honeycreepers and silverswords
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Allopatric
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Mechanisms of reproductive isolation reducing gene flow between populations Sympatric speciation (= same homeland) Mistakes in cell division polyploidy Speciation is instantaneous Autopolyploidy
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Unformatted text preview: Allopolyploidy Ex. Tragopogon spp., wheat Selective mating Ex. Rhagoletis Autopolyploidy Allopolyploidy Tragopogon (goats beard) 3 diploid parent species 2 new tetraploid species Sympatric apple maggot fly Gene flow has been reduced between flies that feed on different food varieties, even though they both live in the same geographic area. Frequency distribution of intraspecific and interspecific (congeneric) genetic divergence in Lycaenidae . Total number of comparisons: 1189 intraspecific and 57562 interspecific pairs across 315 Lycaenidae species. Divergences were calculated using Kimura's two parameter (K2P) model. Wiemers and Fiedler Frontiers in Zoology 2007 4 :8 doi:10.1186/1742-9994-4-8 Divergence Reproductive Isolation...
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VUBio110BSp'08-Speciation 13-POST - Allopolyploidy Ex....

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