BISC 1112 Lecture Notes - Lecture 4: Species Problem, Sympatric Speciation, Species
28 Aug 2016
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Document Summary
The mystery of mysteries that captivated darwin is speciation: speciation. The process by which one species splits into two or more species. Fascinated darwin because it produced the tremendous diversity of life, repeatedly yielding new species that differ from existing ones. Also helps explain the many features that organisms share (the unity of life) Forms a conceptual bridge between microevolution and macroevolution: microevolution. Changes over time in allele frequencies in a population: macroevolution. Broad pattern of evolution above the species level: example: the origin of new groups of organisms, such as mammals or flowering plants, through a series of speciation events. 24. 1: the biological species concept emphasizes reproductive isolation. Species: latin for kind or appearance . The existence of biological factors (barriers) that impede members of two species from interbreeding and producing viable, fertile offspring: these barriers block gene flow between the species and limit the formation of hybrids. Hybrids: offspring that result from an interspecific mating.
