BIOL 226 Chapter Notes - Chapter 24: Sympatric Speciation, Species Problem, Reproductive Isolation
13 Feb 2018
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Speciation: "the process by which one species splits into two or more species" (522) due to evolution, one species can acquire new adaptations and different ones too. Most of these hybrids are sterile because the set of chromosomes from one species cannot pair during meiosis with the set of chromosomes from the other species. Ecological species concept: ecological niche, the sum of how members of species interact with the living and nonliving parts in their environment. Therefore, gene flow gets interrupted, not by the location of the species (since they are close to each other, living in the same area), but instead by factors such as; polyploidy, habitat differentiation, and sexual selection. (aside: these factors also promote allopatric speciation) Hybrid zones can have simple or complex spatial patterns: they can be scattered irregularly, in patched (example: plants) but they can also have species located in a certain are and there is a pattern (example: frogs page 532)
