The 3 embryonic germ layers: ectoderm, mesoderm and endoderm are derived from:
(A) Epiblast only (B) Ectoderm from epiblast; mesoderm and endoderm from hypoblast (C) Ectoderm and mesoderm from epiblast; endoderm from hypoblast (D) Hypoblast only
(A) All three embryonic germ layers (ectoderm, mesoderm and endoderm) are derived from the epiblast only. The hypoblast contributes to the development of the extraembryonic mesoderm and yolk sac and plays a key role in signaling to establish axial patterning in the embryo itself