what is allelic exclusion?
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.