BIO 200 Lecture Notes - Lecture 9: Cichlid, Continental Drift, Argyroxiphium
10 Oct 2016
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Document Summary
Species concepts and reproductive isolation: what is a species, morphological species concept, biological species concept, prezygotic isolating mechanisms, postzygotic isolating mechanisms. Species formation: how does one species become two, allopatric speciation, how is allopatry achieved, is sympatric speciation possible, neat examples of speciation: adaptive radiation and ring species. Individuals of a single species share measureable traits. Species are groups of actually or potentially interbreeding natural populations which are reproductively isolated from other such groups. Non-specie do not make or cannot produce fertile. Different species are reproductively isolated: other species concepts. Each species has history that starts with a speciation event. Phylogenetic tree - species is a tip on the tree. Smallest set of organisms that share an ancestor and can be distinguished by such sets. Treats species as smallest diagnosable cluster of individual organisms in within which there is a parental pattern of shared ancestry and descent. Set of organisms adapted to a place.
