The polypeptide chains of hemoglobin A are composed of: (A) 1 alpha, 3 beta, (B) 2 alpha, (C) 2 alpha, 2 beta, (D) 1 alpha, 2 beta, 1 delta
Answer is C. Hemoglobin A has 2 alpha and 2 beta chains.
HbA2 has two alpha and two delta chains.