What type of hemoglobin disappears before birth?

Normal embryonic hemoglobin is the correct answer because it refers to the types of hemoglobin produced during early stages of embryonic development. Specifically, embryonic hemoglobins, such as Gower 1, are primarily present in the first few weeks of gestation and are eventually replaced by fetal hemoglobins and later by adult hemoglobins as development progresses.

During embryogenesis, hemoglobin plays a crucial role in oxygen transport, but as the fetus grows and the environment changes, the composition of hemoglobin needs to adapt. Fetal hemoglobin, which is more efficient at binding oxygen than adult hemoglobin, becomes predominant as the fetus develops. Thus, normal embryonic hemoglobin disappears before birth as the production of fetal hemoglobin takes over.

In contrast, Gower 1 is an early embryonic hemoglobin type that is still relevant in context but is not the answer sought, as it does not “disappear” in the same manner nor is it classified as a normal embryonic hemoglobin type. Fetal hemoglobin itself does not disappear before birth, as it is what remains present at the time of delivery. Adult hemoglobin, on the other hand, is produced after birth and therefore is not present in significant amounts prenat