What determines whether a muggle born will happen?

[Bruce Alan Wilson]

No: HPFGUIDX 161452

In Hermione's case, I think that there were some Wizardling ancestors way back.
Not all families keep track of their genealogies all that carefully.  Slughorn
referred to a potions master with the surname 'Granger'; what if this Granger
had produced a squib son or grandson who had been one of Hermione's ancestors?
IIRC, the potions master in question lived back in the early 19th C.--long
enough to have been forgotten by his Muggle descendants.  Add another squib
ancestor in Mrs. Granger's line and there you have it--the exact combination of
genes coming together to produce a witch.

BAW


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