Thank you for reporting, we will resolve it shortly
Q.
Fetal haemoglobin has $X$ affinity for oxygen than that of mother's haemoglobin during gestation. $X$ is
Breathing and Exchange of Gases
Solution:
Fetal haemoglobin is the main oxygen transport carrier in human fetus during the last seven months of development in the uterus and persists in the newborn until it is about $6$ months old. Functionally, fetal haemoglobin has a higher affinity to bind with oxygen molecules than the adult (or maternal) haemoglobin, giving the developing fetus better access to oxygen from the mother's blood stream.