In humans,the embryonic and fetal forms of hemoglobin have a higher affinity for oxygen than that of adults.Why is this the case?
A)Nonidentical genes produce different versions of globins during development.
B)Identical genes generate many copies of the ribosomes needed for fetal globin production.
C)Pseudogenes interfere with gene expression in adults.
D)The attachment of methyl groups to cytosine following birth changes the type of hemoglobin produced.

Question

Quizplus · Accepted Answer

During fetal development, nonidentical genes produce different versions of globins, including embryonic and fetal forms of hemoglobin. These forms of hemoglobin have a higher affinity for oxygen in order to facilitate oxygen transportation across the placenta from the mother to the developing fetus. After birth, the production of fetal hemoglobin is gradually replaced by the adult form of hemoglobin.

In Humans,the Embryonic and Fetal Forms of Hemoglobin Have a Higher