Thalassemia is a/an

Thalassemia is a quantitative genetic disorder because very few globin molecules are synthesised in the patient with this condition.

Thalassemia is an autosome-linked recessive blood disease. $\mathrm{\alpha }$Thalassemia is controlled by two closely linked genes HBA1 and HBA2 on chromosome 16 while $\mathrm{\beta }$ Thalassemia is controlled by a single gene HBB on chromosome 11.