Why Thalassemia minor or Mediterranean anemia is prevalent in mediterranean area and not in other places?

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Why Thalassemia minor or Mediterranean anemia is prevalent in mediterranean area and not in other places?

In: Biology
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It’s inherited genetically, but you need a copy from *both* parents.

So if one person with it moves away to a different part of the world, where there’s no Thalassaemia, they are very unlikely to pass it on.

But if two people from a region with lots of Thalassaemia have a child, then there’s a chance that child will get a Thalassaemia gene from each of them.

In many parts of the world, milder versions of Thalassaemia or conditions like Sickle Cell Anaemia may have become relatively prevalent in the population because they are protective against Malaria.