Thalassemia is due to abnormality in _____?

Thalassemia is due to abnormality in _____?

تھیلیسیمیا _____ میں غیر معمولی ہونے کی وجہ سے ہے؟
Explanation

Thalassemia is a genetic blood disorder caused by an abnormality in hemoglobin production.

It leads to reduced oxygen-carrying capacity of red blood cells.