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The HOX genes, which lie on the DNA in the order of the body parts they regulate the development of. So, the part regulating the head lies before the part regulating the chest, then the pelvis, tail etc. All animals have HOX genes, from jellyfish upwards, though they only have two, and the number gradually increases through worms, molluscs arthropods and vertebrates. We have 13. Meddling with the HOX domain causes changes in the overall body plan, for example ribs on the neck vertebrae etc.

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12y ago

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