Mudbloods, Half-Bloods, Pure Bloods, and Genetics

Wed Jan 14 17:06:06 UTC 2004

No: HPFGUIDX 88693

I have a strange question that I know has been touched upon in some 
ways by past posts.  It has been 17 years since I had genetics so my 
knowledge is very rusty.  How is magic passed down genetically?  
1.  It cannot be Dominant, given that there are squibs and mudbloods.
2.  It cannot be complete recessive, given that there are halfbloods.
3.  At what point is a wizard a pureblood?  
4.  Is magic genetic at all?  