BIOL 1202 Chapter : BIOL 1202 Chapter 24 Outline
Document Summary
Biol 1202: chapter 24 the origin of species. The origin of new groups of organisms, such as mammals or flowering plants, through a series of speciation events. The biological species concept emphasizes reproductive isolation: the biological species concept: One strength of the biological species concept is that it directs our attention to a way by which speciation can occur: by the evolution of reproductive isolation. The biological species concept does not apply to: fossils, organisms that produce asexually. In the biological species concept, species are designated by the absence of gene flow: researchers argue that this concept overemphasizes gene flow and downplays the role of natural selection, other definitions of species: Ecological species concept: views a species in terms of its ecological niche, the sum of how members of the species interact with the nonliving and living parts of their environment: can accommodate asexual and sexual species. Speciation can take place with or without geographic separation.
