B cells suppress the expression of all but one heavy chain allele and one light chain allele,

Question:

B cells suppress the expression of all but one heavy chain allele and one light chain allele, a process known as allelic exclusion, by inhibiting the further somatic recombination of heavy and light chain genes after a productive recombination has occurred. Describe the aberrant properties of immunoglobulins produced by a B cell in which allelic exclusion is defective.