Origin of Species

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Cladogenesis - the origin of new genetic lineages - the formationof new species - speciationWhat is a species?Whether two organisms are the same species or not, for mostspecies, is not a difficult decision - house cats vs. dogs, groupersvs. tarpon, oaks vs pines. The difference between species reflectsmany generations of independent evolution and divergence froma common ancestor.2
The question is sometimes more difficult - when closely relatedforms are compared. The similarity is due to each only divergingslightly from their common ancestor.These snakes areall thought to bethe same species,having differentcoloration, andliving in differentareas of thecountry. They areclassified assubspecies of thesame species.3
Page 1: Evolution IIIThe Origin of SpeciesN
Page 5 and 6: The biological species concept - a
Page 7 and 8: Ecological isolation occurs whentwo
Page 9 and 10: Temporal isolation occurs when two
Page 11 and 12: Hybrid sterility isolates species.
Page 13 and 14: The geographic isolationmay involve
Page 15 and 16: Speciation can also occur within th
Page 17 and 18: Anagenesis and cladogenesis combine
Page 19: “Nothing in biology makes senseex

Origin of Species

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