Q.98
Onset of gastrulation is linked to the morphological appearance of:
- Morphological Hallmark of Gastrulation: In avian and mammalian embryonic development, the onset of gastrulation is demarcated by the appearance of the Primitive Streak on the caudal epiblast surface.
- Significance: Establishes bilateral symmetry and provides the furrow through which epiblast cells migrate inward to form the definitive endoderm and mesoderm.
Correct option: (1) Primitive streak
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