Allelic exclusion is a process by which only one allele of a gene is expressed while the other allele is silenced.
For most genes, the individual inherits one copy of each gene from each parent. Each copy of the gene is called an allele.
allelic exclusion
the principle stating that in an antibody-producing cell, the DNA splicing process required for the formation of an active antibody gene occurs in only one allele ...
Allelic exclusion: Expression of only one of the two homologous alleles at a locus in the case of heterozygosity.
 See also: Gene, Cell, Cells, DNA, Expression
  
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