Q. What is the hemoglobin F? Why does the fetus need different hemoglobin?
Hemoglobin F is the hemoglobin found in the hemoglobin and mammalian fetus.
A is the normal hemoglobin, Hemoglobin F has higher affinity for oxygen and the fetus needs hemoglobin capable of extracting oxygen from the mother's circulation therefore the fetus uses hemoglobin F since it has higher affinity for oxygen than the mother's hemoglobin.