[HPforGrownups] Re: Many responses (Molly's age, Hagrid, JKR stuff, unforgivables, etc) - also, Moody's Eye

[Bart Lidofsky]

No: HPFGUIDX 174047

From: Zara <zgirnius at yahoo.com>
>I assume Rowling meant a few generations back, far enough to ensure 
>that the family is no longer aware of the witch/wizard ancestor. 

Bart:
There have been some rather interesting genetic descriptions on this board as to how magic works (genetically, the way that JKR does it makes a single recessive gene impossible; what has been theorized was a combination of two genes). 

But here is another possible factor: People with magic in their genes give off different pheremones than Muggles, and tend to be sexually attracted to each other, and repulse those without magical genes. 

Bart