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Bithorax complex
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<p>The Bithorax complex (BX-C) is one of two <i><a href="/facts/Drosophila_melanogaster/KtnHVCcB">Drosophila melanogaster</a></i> <a href="/facts/Homeotic_gene/r7Ptbfbk">homeotic gene</a> complexes, located on the right arm of chromosome 3. It is responsible for the differentiation of the posterior two-thirds (posterior thorax and each abdominal segment) of the fly by the regulation of three genes within the complex: <a href="/facts/Ultrabithorax/Ee9EPKD2"><i>Ultrabithorax (Ubx)</i></a><i>, abdominal A (abd-A),</i> and <i>Abdominal B (Abd-B)</i>. </p><p>A complete deletion of this complex results in the posterior segments of the <i>Drosophila</i> embryo becoming copies of the second thoracic segment. </p>