Which of the statements are correct about Thalassemia?
A. In ẞ Thalassemia, production of a globulin chain is affected and in a Thalassemia production of B globulin chain is affected.
B. a Thalassemia is controlled by two closely linked genes HBA1 and HBA2.
C. The genes HBA1 and HBA2 are located on chromosome 11 of each parent.
D. ẞ Thalassemia is controlled by a single gene HBB.
E. The gene HBB is located on chromosome 16 of each parent.
Choose the correct answer from the options given below:

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.