Species Fusion
A postzygotic reproductive barrier is a mechanism that reduces the viability or reproductive capacity of hybrid offspring. Spatial isolation is a type of prezygotic barrier in which different species are reproductively isolated by location. Temporal isolation is a type of prezygotic barrier in which different species are reproductively isolated by different mating seasons. Speciation can take place in two general ways. A single species may change over time into a new form that is different enough to be considered a new species. This process is known as anagenesis. More commonly, a species may become split into two groups that no longer share the same gene pool. This process is known as cladogenesis. There are several ways in which anagenesis and cladogenesis may take place. In all cases, reproductive isolation occurs. Behavioral isolation is a type of prezygotic barrier in which species are reproductively isolated because individuals in one species reject individuals of another species as possible mates. To unlock this lesson you must be a Study.com Member. (Genetic isolation differs from gene isolation, which is the isolation of a particular gene from the rest for use in g enetic engineering). Related forms: genetic isolate (noun). See also: speciation, gene pool. 1 Species Fusion-two species in a hybrid zone may have weak reproductive isolating barriers, and the two species may, over time, eventually share a common gene pool. 2  Species Stability/Hybrid Equilibrium-Hybrids are continually produced by the two parent populations in a hybrid zone. Supplement. Genetic isolation may be the result of geographic isolation or of other isolation mechanisms that prevented successful reproduction. This may lead to speciation (formation of new species) and endangering species to extinction due to a small gene pool.
http://study.com/academy/lesson/speciation-ii-prezygotic-barriers.html http://www.sparknotes.com/biology/evolution/speciation/section2.rhtml http://study.com/academy/lesson/speciation-ii-prezygotic-barriers.html http://www.biology-online.org/dictionary/Genetic_isolation http://www.bio.miami.edu/dana/dox/reproductive_isolation.html http://www.biology-online.org/dictionary/Genetic_isolation
what type of barrier isolates gene pools