Animals as diverse as corals and monkeys have d) presence of Hox genes in common.
Structure of the HOX gene/protein and mutations found in limb malformation HOX genes are made up of two exons and one intron. Exon 2 contains a 180-nucleotide sequence known as the homeobox, which encodes a 60-amino acid helix-turn-helix motif with DNA-binding activity known as the homeodomain.
Hox genes control embryonic development in all animals, including humans, flies, and worms. They choose which body parts go where. Not surprisingly, if these genes fail, the consequences can be disastrous.
Hox genes are a subset of homeobox genes that specify regions of an embryo's body plan along the head-tail axis of animals. Hox proteins encode and specify 'position' characteristics, ensuring that the correct structures form in the correct places on the body.
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