Where do primordial germ cells initially develop: (A) In the gonads at week 4 of embryonic development, (B) In the yolk sac at week 4 of embryonic development, (C) In the gonads at month 5 of embryonic development, (D) In the yolk sac at month 5 of embryonic development
Answer is B. Primordial germ cells, the predecessors to gametes, are first seen in the wall of the yolk sac at week 4 of embryonic development They migrate into the gonads at week 6.