A Caucasian couple is concerned that their unborn baby will…

A Caucasian couple is concerned that their unborn baby will have cystic fibrosis (CF). They already have a 4-year-old daughter. A dot blot analysis is performed to genotype the family for the F508 deletion in the CFTR gene. Probes complementary to the region spanning the F508del and to the wild type (WT) sequence in that region (WT) are spotted onto a membrane.  The membrane was then separated into four strips and hybridized to amplified CFTR DNA obtained from each parent, their 4yo daughter (child) and the fetus.  The results are shown in the figure (black indicates a positive hybridization result). Which of the following can be concluded from the dot blot analysis?