In Almost All Organisms That Have Been Studied, the Genes

Multiple Choice

In almost all organisms that have been studied, the genes in Hox clusters:

A) are arranged in chromosomes in the same order as their products function along the anterior-posterior segments of the embryo.
B) are expressed in a sequence that is independent of their linear organization along the chromosome.
C) each contain a unique homeodomain, the products of which are very different among organisms.
D) are arranged in the chromosomes in a sequence that is independent of the order in which their products function along the anterior-posterior axis of the embryo.
E) None of the answer options is correct.