[HPforGrownups] Re: The Mauraders' Generation -- Genetics

[Juli]

No: HPFGUIDX 123619



> 
> <xcpublishing at y...> wrote:
>  
> > 
> > I would really like to have some explanation from
> JKR about the 
> > genetics behind all this - some Muggles can have
> witch/wizard kids 
> > and some witch/wizards can have squib kids.  Where
> is the logic?   

Juli:

Genetics are kinda tricky, there's only one way for
Mendelian genetics to work in the WW: The wizard gene
(W) is a dominant trait in wizards so every
son/daughter will be a wizard, but if both parents are
heterocygotes (Ww), their children have 3
ossibilities: WW (wizard), Ww (wizard)and ww (squib).
this could explain squibs. 

Muggle-born wizards could be explained this way: in
this case (muggle families), the wizard gene is
recesive (m)so if we've got to heterocygote parents Mm
and Mm (both muggles) then their children have these
possibilities: MM (muggle), Mm (muggle), mm (wizard).

An other possibility is spontaneous mutation for
muggle families where a M could change into m, but the
chances for this are way to small, they can't account
for all muggle-borns.

So my advice to you is to stop trying to make sense
out of it and just play along.

Juli

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