A human zygote has three immunoglobulin loci, one that specifies the heavy chain and two that specify the light chain. Taking into account differences between maternal and paternal alleles a B cell might be expected to have the potential of making a total of two different heavy chains and four different light chains, and therefore eight different immunoglobulins. Instead, each mature B cell makes just a single type of immunoglobulin. How does that happen?

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The Answer of A human zygote has three immunoglobulin loci, one that specifies the heavy chain and two that specify the light chain. Taking into account differences between maternal and paternal alleles a B cell might be expected to have the potential of making a total of two different heavy chains and four different light chains, and therefore eight different immunoglobulins. Instead, each mature B cell makes just a single type of immunoglobulin. How does that happen?

A Human Zygote Has Three Immunoglobulin Loci, One That Specifies