Hi,
Well, we all know that blood is made in the bone marrow (mostly); the transplant is the replacement of the Thal. bone marrow only with the non-Thal. one. The rest of the body still contains the same old-Thal. DNA which is not involved in the manufacture of blood. Therefore, the reproductive system still consists of cells containing the Thal. DNA. which will pass on to the future generation and has nothing to do with bone marrow or it's transplant.
Take care, Peace!