Beta thalassaemia is an inherited condition. If you inherit 2 faulty genes, 1 from each of your parents, you will have beta thalassaemia major or intermedia. If you inherit a single faulty gene from 1 of your parents, you will have beta thalassaemia trait. If you have beta thalassaemia trait, it's possible that your children will inherit the trait(there is a 1 in 2 chance).If both you and your partner have beta thalassaemia trait, there's a risk that your children may have beta thalassaemia major or intermedia. There is a 1 in 4 chance of each of your children having thalassaemia major.
Attribution: BUPA