Biology 1001A Lecture Notes - Hybrid Swarm, Macroevolution, Founder Effect
4 Sep 2013
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Document Summary
If luca had just continued to evolve and not speciated we would have one single species represented on earth. Speciation: marks the interface between micro and macroevolution. No one species concept can be agreed on. Organisms are grouped based on phenotypic characteristics identifies species based on similarity species: things that look similar, morphologically more similar to eachother than they are to any other group of organisms. All of the happy faced spiders look completely different however they can interbreed they would have to be classified as four different types of spiders (but they"re not) Pronounced sexual dimorphism, males will look extremely different from females, so they would seem to be two different species. Most widespread species: interbreeding (or potentially interbreeding) group of individuals, reproductively isolated form other groups the spiders are not reproductively isolated, so they are one species according to the biological species concept (polymorphic, single species.
