The Hox genes came to regulate each of the following in what sequence, from earliest to most recent?
1. identity and position of paired appendages in protostome embryos
2. anterior-posterior orientation of segments in protostome embryos
3. positioning of tentacles in cnidarians
4. anterior-posterior orientation in vertebrate embryos
A) 4 ? 1 ? 3 ? 2
B) 4 ? 2 ? 3 ? 1
C) 4 ? 2 ? 1 ? 3
D) 3 ? 2 ? 1 ? 4
E) 3 ? 4 ? 1 ? 2
Answer: D
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