Biology 1001A Lecture Notes - Lecture 21: Liger, Allopatric Speciation, Speciation
Document Summary
Black bears: some species have morphological distinctions - polymorphism some have white fur (spirit bears - different enough to call them a different species) Hybrid? (coyotes and other species - not to be protected) 150+ years after origin of species, still now perfect de nition of species: over 50 species concepts have been proposed (3 main important ones, none of them are easily applicable to all organisms. How many species? e. g. happy face spiders - recognizing four different species or lump them all together. How do species become reproductively isolated/ diagnosable distinction/ evolutionarily independent: what was orignially one population becomes sub-divided for because of a barrier (geographic, populate different locations, etc. ) Outcome of secondary contact: may resume interbreeding, haven"t been diverging for a very long time - continue to interbreed as a part of the same species (speciation that began stops= species collapse - become on interbreeding population again)
