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.
From Wikipedia, the free encyclopedia. Allelic exclusion is a process by which only one allele of a gene is expressed while the other allele is silenced. For autosomal genes, diploid organisms inherit one copy from each parent.At least two distinct selection events can lead to allelic exclusion.On one hand, one allele of the gene can be transcriptionally silent, which would result in the expression of only the second allele.or autosomal genes, diploid organisms inherit one copy from each parent. At least two distinct selection events can lead to allelic exclusion. On one hand, one allele of the gene can be transcriptionally silent, which would result in the expression of only the second allele.