BIO 200 Lecture Notes - Lecture 20: Sympatric Speciation, Reproductive Isolation, Speciation
31 Oct 2017
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Rankings: domain, kingdom, phylum, class, order, family, genus, species, typological (morphological) species- a group of organisms that share certain characteristics which are different than other groups- usually differences in anatomy. Each kind of organism is fixed and immutable and can be represented by an ideal individual, the type specimen (linnaean nomenclature: biological species concept- reproductively isolated group of actually interbreeding natural populations that produce fertile offspring. This definition is hard to apply because most organisms don"t live together and have have a chance to interbreed. There is sympatric species (ranges overlap which is easy) and allopatric species (ranges don"t overlap which is hard) Biological species definition used 10% of the time. Morphological and chemical differences are used 90% of the time. California separated by mountains: asexual species- can"t use biological species definition (each cell is separate from the other cell, no sex, fossil species- can"t use biological species definition (don"t have enough evidence, no interbreeding in fossils)
