Which of these types of anaemia is caused by a genetic abnormality in the haemoglobin

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Sickle-cell anemia is caused by a genetic abnormality in the hemoglobin protein, leading to abnormal shaped red blood cells that can get stuck in small blood vessels, causing pain and organ damage. Pernicious anemia is caused by a deficiency in vitamin B12, megaloblastic anemia is caused by a deficiency in folic acid or vitamin B12, and hemorrhagic anemia is caused by excessive bleeding.

Which of These Types of Anaemia Is Caused by a Genetic