what are the characteristics of hox genes? (check all that apply.) check all that apply adjacent groups of hox genes form hox complexes.adjacent groups of hox genes form hox complexes. in vertebrates, hox genes play a key role in the anteroposterior vertebrates, hox genes play a key role in the anteroposterior axis. hox genes are present in vertebrates but not in genes are present in vertebrates but not in drosophila. the coding sequence of hox genes contains the coding sequence of hox genes contains the homeobox. knockout genes have been used to determine the function of hox genes.knockout genes have been used to determine the function of hox genes.