Your hemoglobin type is inherited through family genes. The color of your hair, the color of your eyes, your body build, and your hemoglobin type are examples of things about you that are determined by your genes. You receive one gene for hemoglobin type from your mother and one from your father.
Hemoglobin A or normal adult hemoglobin is the most common type. There are over 500 different types or variations of hemoglobin.