Primordial germ cell is derived from:: (A) Ectoderm, (B) Mesoderm, (C) Endoderm, (D) Mesodermal sinus
Answer is A. A i.e. EctodermPrimordial germ cell develops from epiblast (primitive or primary or embryonic ectoderm)Q at the caudal end of primitive streak in the caudal end of embryo. In the 3rd week, primordial germ cells migrate to a mass of extra embryonic mesoderm and then into the endoderm of yolk sac wall.