This is a less preferred form of foundation for Utilihab use but does allow for its use with some alternative materials, such as stacked stone, soil-cement, clay block, and compressed earth block.
Gametic isolation refers to a set of circumstances whereby gametes are isolated or separated from their matches by a medium or distance. This description also refers indirectly to reproductive isolation, in which a gamete cannot interact with the gametes of another species.
Postzygotic Barrier. Reproductive isolation mechanism that acts after the point of conception. Postzygotic reproductive barriers act after the point of production of the zygote, contrasting prezygotic barriers which instead act to prevent conception.This represents a fundamental difference because up to the point of conception no eggs have been wasted nor progeny.he mule is the classic example of a postzygotic barrier as they almost always display a reduced hybrid fertility, and this is despite the fact that mules are otherwise impressively robust animals. For more on this topic, see Wikipedia and Google. Contact web master.