BIOL 103 Lecture Notes - Lecture 5: Species
11 Apr 2014
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Document Summary
Increased availability of objective markers of shared common ancestry from molecular sequences have increased the popularity of the phylogenetic species concept". 2 continents, but the phylogenetic species concept confirms no more: gradually in situ or by more rapid division of ancestral and no less than 3 species. Populations within each species are too similar to form distinct branches: usually allopatric sometimes in sympatry, gene flow reduced by rims", latin is used bc it doesn"t change, groups of species defined by selective characteristics, money flower, genus mimulus, humans use artificial selection to produce a huge variety of population dogs. Different species concepts each have strengths and weaknesses more than one may be useful: elephants are found in asia an africa (cid:224) some island population of elephants were seen as distinct species, molecular makers (cid:224) theyre just populations depending on context and question.
