I'd probably fail the quiz but I get your point (I think).
I recall TKT saying they believe the incidence of females was likely to equal that of males. I don't recall if there was any data on the severity of the disease or the age of onset of symptoms.
Females could have one healthy x chromosome and therefore the alpha-gal enzyme levels could be close to normal levels. Males on the other hand will have little to no alpha-gal because the only x they have will be mutated. Therefore the alpha-gal activity increase can be better observed in males because they will have little to begin with.