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Study Questions 1. Can you recall some of the interactions, occurring in both directions, between the neural tube and the somite?
2. In the last chapter, we learned that Sonic Hedgehog (Shh) helps organize the differentiation of the neural tube. Does Shh influence somite differentiation?
3. The pronephric (Wolffian) duct extends posteriorly. Can you suggest an experiment to help illuminate the mechanism of this posterior elongation?
4. Can you design and experiment to tell whether the hematopoeitic cells of the adult chick form from stem cells that arose in the embryonic yolk sac?
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