BISC 102 Chapter Notes - Chapter 27: Synapomorphy, Sympatry, Alpheidae
10 Aug 2016
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Document Summary
Speciation occurs when populations of the same species become genetically isolated by lack of gene ow and then diverge from each other due to selection, genetic drift, or mutation. Populations can be recognized as distinct species if they are reproductively isolated from each other, if they have distinct morphological characteristics, is they exploit di erent sets of resources , or if they form independent branches on a phylogenetic tree. Populations can become genetically isolate from each other if they occupy di erent geographic areas, if they use di erent habitats or resources within the same area, or if one population is polyploid and cannot breed with the other. When populations that have diverged come back into contact, they may fuse, continue to diverge, stay partially di erentiated or have o spring that form a new species.
