Thalassaemia is:

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(A) Thalassaemia is an autosome-linked recessive blood disorder.$(i)$ It occurs due to either mutation or deletion,resulting in a reduced rate of synt

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Autosomal recessive disease

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(A) Thalassaemia is an autosome-linked recessive blood disorder.$(i)$ It occurs due to either mutation or deletion,resulting in a reduced rate of synthesis of one of the globin chains of haemoglobin.$(ii)$ Anaemia is the characteristic symptom of this disease.$(iii)$ Thalassaemia is classified into two types:$1.$ $\alpha$-thalassaemia: The production of the $\alpha$-globin chain is affected. It is controlled by the closely linked genes $HBA1$ and $HBA2$ on chromosome $16$. It occurs due to the mutation or deletion of one or more of the four genes.$2.$ $\beta$-thalassaemia: The production of the $\beta$-globin chain is affected. It occurs due to the mutation of one or both $HBB$ genes on chromosome $11$.

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