A 25-year-old woman has mild expression o fhemophilia A . A genetic diagnosis reveals that she is a heterozygous carrier of a mutation in the X-linked factor VIII gene. What is the most likely explanation for mild expression of the disease in this individual?
A.
A high proportion of the X chromosomes carrying the mutation are active in this woman
B.
Her father is affected, and her mother is a heterozygous carrier
C.
Nonsense mutation causing truncated protein
D.
One of her X chromosomes carries the SRY gene
E.
X inactivation does not affect the entire chromoso