But the procedure was designed to help parents who carry genes for "sex-linked" diseases, such as hemophilia and Duchenne muscular dystrophy, that occur almost exclusively in boys.
When their doctor shares their curiosity, though, he may well fear the presence of some sex-linked hereditary disease such as hemophilia, or certain disorders accompanied by mental .
IVF recruited couples who wanted a child of a particular sex, either to bring "gender balance" to their family or to help them avoid sex-linked genetic diseases for which their .