Problem: What would be the consequences of allowing the expression of more than one H and/or L chain gene (having no allelic exclusion) during B cell development? How many types of BCRs could be made if the cell expressed 2 kinds of H chains but only one kind of L chain? How many types of BCRs could be made if there were 2 H chains and 2 L chains expressed? Why would this be a bad thing for B cells?