1- Gastrulation is the process of
generating the ectoderm and mesoderm
establishing three germ cell layers
forming the embryonic disk
extension of the primitive streak

2- Caused by a convergence of epiblastic cells very early in gastrulation
primitive streak
primitive groove
primitive node
bilaminar embryonic disk

3- Migrating epiblast cells
pass through the primitive node
accumulate at a small structure called the primitive groove
form a new cell layer between the epiblast and hypoblast
converge at the hypoblast

4- Epiblast cells passing through the primitive node form the
mesoderm
ectoderm
primitive groove
notochord

5- Cellular determination is
formation of mesoderm, ectoderm and endoderm
migration of cells through the primitive streak
a commitment by an embryonic cell to a particular specialization path
final specialization of an embryonic cell into adult tissue

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Answers:

1- Gastrulation is the process of
Answer: establishing three germ cell layers (mesoderm, ectoderm and endoderm)

2- Caused by a convergence of epiblastic cells very early in gastrulation
Answer: primitive streak
(primitive groove and primitive node appear later)

3- Migrating epiblast cells
Answer: form a new cell layer between the epiblast and hypoblast

4- Epiblast cells passing through the primitive node form the
Answer: notochord

5- Cellular determination is
Answer: a commitment by an embryonic cell to a particular specialization path