10. After gastrulation in a mouse embryo, the expression of Hox genes in a variety of tissues determines the segmental identity along the anterior-posterior axis. a. How are the Hox genes in a vertebrate different than Drosophila, how are they the same? b. Give on example of an embryonic tissue or structure in a mouse (or another vertebrate embryo) that we discussed in which the Hox gene expression pattern determines segmental identity. c. If the expression of a particular Hox gene was altered so that is was no longer expressed in the embryonic tissue that you described in part b, what would happen to development of that tissue or structure?.