Part B: Cleavage & Gastrulation in the Chick embryo 49. How would you describe the cleavage pattern in the chick egg? What pattern of cleavage is this called? 50. Why do you think the initial cleavages of the chick egg are meroblastic (incomplete) rather than Holoblastic (complete)? 51. What cavity underlies the area pellucida? 52. What is the name of the cavity that lies between the epiblast and the hypoblast? 53. What is the hypoblast and how is it formed? 54. What is the primitive streak, and how is it formed? 55. During chick gastrulation, what germ layer remains external and does not move inward?

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