A couple presents for genetic counseling after their 4-year-…
A couple presents for genetic counseling after their 4-year-old son is diagnosed with Fragile X syndrome (FXS). Genetic testing reveals that the mother carries a premutation of the FMR1 gene (120 CGG repeats), and the father has normal repeat numbers. The parents ask about recurrence risk and inheritance patterns for future children.Which statement by the nurse demonstrates the most accurate understanding of Fragile X syndrome inheritance?