Squibs have genes to do magic?

[Birgit]

No: HPFGUIDX 146475

> Jazmyn Concolor:
> Squibs are not rare.  It's noted (somewhere in the books) that 
> more squibs are born to purebred families.

Quote from JK's website:

"Squibs are rare; magic is a dominant and resilient gene." 

So, yes, Squibs ARE rare. It is not a common occurance. Of 
course, as has been pointed out, the gene thing does not hold 
water. Frankly, no gene theory holds water - if Magic were a 
dominant gene, we would see more Squibs (since there would be 
more heterozygotic gene sets, with a recessive 'no magic' gene.) 
But Squibs are rare. Also, there would be no Muggle born wizards 
- since all the parents would have to carry the recessive "no 
magic" gene, there is no chance of a child turning up magical.

On the other hand, if the 'magic' gene were recessive, then 
wizard half-bloods should be exceedingly rare, since, if we take 
gene distribution for other 'special' recessive genes like 
albinism, for example, the trait should only be carried by a 
small percentage of the Muggle population. Instead, we see that 
children in a wizard/Muggle marriage tend to be magical (which 
would point to a dominant gene.) 

So either way, it doesn't work.

                              Birgit (cecelle on fanfiction.net)