A pregnant woman is able to transfer oxygen to her fetus because fetal hemoglobin has a greater affinity for oxygen than does adult hemoglobin.
What is the single most likely reason of the higher affinity of fetal hemoglobin to oxygen?

Question

A pregnant woman is able to transfer oxygen to her fetus because fetal hemoglobin has a greater affinity for oxygen than does adult hemoglobin. 
 What is the single most likely reason of the higher affinity of fetal hemoglobin to oxygen?

Answer

the gamma-chains of fetal Hb lack positive charges in the 2,3 BPG pocket

Answer

there is less 2,3-BPG in fetal circulation as compared to maternal circulation

Answer

the oxygen-dissociation curve of fetal hemoglobin is shifted to the right

Answer

the Bohr Effect is more enhanced in the fetus

Answer

the taut T-form of hemoglobin is more prevalent in the fetal circulation

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A pregnant woman is able to transfer oxygen to her fetus because fetal hemoglobi...

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