Medicine General 803d67c8 2 zeta and 2 gamma chains are present in which hemoglobin A Hb Portland B Hb gower I C Hb gower II D HbA2 High-Yield Explanation Hb portland - 2 zeta & 2 gamma. Hb Gower I - 2 zeta & 2 epsilon. Hb gower II - 2 alpha & 2 epsilon.