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

question 4

Multiple Choice

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.

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