____ is a form of hemoglobin that is not able to carry oxygen.

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Methemoglobinemia is a condition where the iron in hemoglobin is in the oxidized form and is not able to carry oxygen. This can lead to tissue hypoxia and cyanosis. Polycythemia is a condition where there is an increase in the number of red blood cells, and Congenital hemolytic anemias are a group of inherited disorders where the red blood cells are destroyed faster than they can be produced. Sickle cell anemia is a genetic disorder where the red blood cells are abnormally shaped, leading to a reduced ability to carry oxygen. However, sickle cell hemoglobin is still able to carry oxygen, albeit less efficiently than normal hemoglobin.

____ Is a Form of Hemoglobin That Is Not Able