BIOL 101 Chapter Notes - Chapter 18: Convergent Evolution, Polyploid, Sympatric Speciation
Document Summary
Biological species concept: uses breeding among organisms to make classifications. Speciation: development of new species through evolution. no longer in equilibrium/state in flux. Reproductive isolating mechanism: defined as any factor that in nature, prevents interbreeding between individuals of the same species or closely related species. ( geographic species) Sympatric speciation: any speciation that does not involve geographic separation. Allopatric speciation: when geographic separation plays a part in the evolution of a species. Homologues: common structures in different species that result from a shared ancestry. Analogy: a feature in different organism that is the same in function and superficial appearance. Convergent evolution: when nature has shaped two separate evolutionary lines in analogous ways. convergent evolution can take place within species. of environmental pressures lead to the same kinds of physical features. Ancestra characters: existed in an ancestor common in any group of species.
