The ability of one person to produce over a million different antibody molecules does not require over a million different genes; rather, this wide range of antibody production is due to . The ability of one person to produce over a million different antibody molecules does not require over a million different genes; rather, this wide range of antibody production is due to . crossing over between the light and heavy chains of each antibody molecule during meiosis I alternative splicing of exons after transcription genetic DNA recombination rearrangements of cytosolic proteins in the thymus cells increased rate of mutation in the RNA molecules