What are some problems that can occur from an altered gene that makes hemoglobin?

The most common is the development of sickle cell anemia. This is as a result of a mutation in the hemoglobin gene that affects the beta polypeptide chain of the protein. This reduces HB’s affinity to oxygen. Other problems include Thalassaemia, Porphyria, and Carbon Monoxide Poisoning.

i think that d. wind is the answer.   i missed the question when i answered a. currents.