The following are four cases of observed speciation. 1) Speciation occured in a strain of

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The following are four cases of observed speciation. 1) Speciation occured in a strain of Drosophila paulistorum sometime between 1958 and 1963 in Theodosius Dobzhansky's lab. He wrote this up in: Dobzhansky, T. 1973. Species of Drosophila: New Excitement in an Old Field. Science 177:664-669 2) A naturally occurring speciation of a plant species, Stephanomeria malheurensis, was observed in Burns County, Oregon. The citing is: Gottlieb, L. D. 1973. Genetic differentiation, sympatric speciation, and the origin of a diploid species of Stephanomeria. American Journal of Botany 60(6):545-553 3) In the 1940's a fertile species was produced through chromosome doubling (allopolyploidy) in a hybrid of two primrose species. The new species was Primula kewensis. The story is recounted in: Stebbins, G. L. 1950. Variation and Evolution in Plants. Columbia University Press. New York 4) Finally, two workers produced reproductive isolation between two strains of fruit flies in a lab setting within 25 generations. I don't have the paper handy, so I can't give the species. The partial citing of the paper is: Rice and Salt 1988. American Naturalist 131:911-

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