What would you predict about the presence of Hox genes in the last common ancestor of vertebrates and invertebrates? (Select all that apply)
A. The genes specified anterior-posterior development.
B. If mutated, there would be an extra pair of wings and legs growing from the head.
C. The genes contained a MADS-box.
D. That ancient ancestor was too primitive to have Hox genes.
E. The genes were in four clusters.
F. The genes were in anterior-posterior order on the chromosome.
G. The genes contained homeoboxes.
Answer: G
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