An organism has four segments (head, thorax, abdomen, tail), and the segment identities are determined by the genes HoxA, HoxB, HoxC and HoxD. (and that is their order on the chromosome and their order of expression) If HoxC is deleted:The abdomen segment will form but it will assume a "thorax identity." The thorax segment will fail to form. The abdomen segment will fail to form. The thorax segment will form but it will assume an "abdomen identity."