BLG 144 Chapter 26: Chapter 26
8 Mar 2017
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Document Summary
If gene flow ends, allele frequencies in isolated populations are free to diverge meaning that the populations begin to evolve independently of each other. The biological species concept: the biological species concept states that the critical criterion for identifying species is reproductive isolation. Cannot be evaluated in fossils or species that reproduce asexually. Can be applied to sexual, asexual and fossils: this concept cannot identify cryptic species, which differ in other traits than morphology, the morphological features used to distinguish species are subjective. Which favors characteristic traits that benefit an organism in exploiting specific resources and coping with a set of environmental challenges: this concept is most useful for identifying bacteria, archaea, or asexual eukaryotes. Sets from different species: polyploidy individuals are genetically isolated from the original diploid population and thus evolutionary independent, because tetraploid individuals can breed with other tetraploids but not with diploids.
