Your Inner Fish Chapters 5-6

CHAPTER 5

1. Why are the trigeminal and facial cranial nerves both complicated and strange in the human body?
2. List the structures that are formed from the four embryonic arches (gill arches) during human development.
3. What are Hox genes and what role do they play?
4. What exactly is the fundamental blueprint for the head and describe?
5. What is the pattern similarity between shark and human skulls?
6. Why is Amphioxus such an important specimen for study despite being a small invertebrate?

CHAPTER 6

1. What is meant by “ontogeny recapitulates phylogeny?”
2. What is the Organizer and why is it important?
3. Describe the blastocyst stage in embryonic development.
4. What role do the ectoderm, mesoderm, endoderm each play in embryo development?
5. What are Noggin genes and what role do they play?
6. What type of gene is Noggin?
7. Is Noggin an activator or a suppressor?