<prompt> Fetal hemoglobin containsa 2, ss 2a 2, d 2a 2, g 2None  <response>: The blood of the human fetus normally contains fetal hemoglobin hemoglobin F. Its structure is similar to that of hemoglobin A except that the b chains are replaced by g chains; that is, hemoglobin F is a2g2. The g chains have 37 amino acid residues that differ from those in the b chain. Fetal hemoglobin is normally replaced by adult hemoglobin soon after bihRef: Ganong;s Review of medical physiology 25th edition. Page: 557 