of a normal person is AA. Supposing you marry this lady then 4 possibilities of your child's genotype will be AA, AS, AC, SC. In the first case your child will be absolutely normal. if she/he is AS or AC she/he will be a carrier of an abnormal gene but will lead a healthy life. The problem is in the 4th possibility of SC genotype. This combination leads to a disease condition associated with many problems. So statistically speaking you will have a75% chance of having a healthy child.
There are technique available these days which can tell you the genotype of the fetus during pregnancy
. If the fetus is detected to have an abnormal genotype the parents an take the decision to terminate the pregnancy.
Hope that answers your query.
Wishing you good luck.