Video answering a question about a refrigerator's defrost cycle. This video answers the question of how often does a refrigerator go into defrost. If you have questions about appliances that you want an answer to, leave them in the comment section below.ideo answering a question about a refrigerator's defrost cycle. This video answers the question of how often does a refrigerator go into defrost. If you have questions about appliances that you want an answer to, leave them in the comment section below.
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.
In summary, a postzygotic reproductive barrier is a mechanism that reduces the viability or reproductive capacity of hybrid offspring. Hybrid zygote abnormality is a type of postzygotic barrier in which hybrid zygotes fail to mature normally.Hybrid infertility is a type of postzygotic barrier in which hybrids are incapable of producing offspring.Low hybrid viability is a type of postzygotic barrier in which the viability of hybrid offspring is lower than offspring in either population.ostzygotic reproductive barriers occur after the zygote has formed, meaning they either reduce the viability (which basically means the ability to avoid dying) or the reproductive capacity of the hybrid offspring.