Wizzarding-muggles blood. I still don´t get it! Help!

[pollynesbitt]

No: HPFGUIDX 125599



Ok, This is a long question about how a muggle goes about becoming a 
wizard.
First question : are wizards-witches part of the human race? A race 
that has both muggles and wizards in it´s geneology?
Or are wizards a different species alltogether? ( and how long does a 
full blooded wizard live?)

Which brings me to my most important question: How does a full 
blooded muggle ( like Hermy) become a witch?
Is it a gene thing or a state of mind? Because, the way I see it, She 
comes to Hogwarts as a muggle, but will leave as a witch.
Or was she already a witch from birth? If so, how did that happen? 
Did she "Mutate"? Did she have a late great wizard grandfather or 
what?
And if she is a wizard from birth, why isn´t she pure blood? I would 
think that anyone born a witch or wizard would be of pure blood...

And lets say for instance that she were to marry someone like Neville 
or Draco ( of pure wizard blood), would their children be pure bloods 
or " mud bloods" because of their grandparents?
So how many generations would it take before they would actually be 
pure bloods? Or are pure blood families rapidly becoming extinct 
without the possiblity of regenerating?
And is there a difference between dirty bloods, mud bloods and half-
bloods? 
Would a muggle born be a "dirty-blood" and someone like Harry be a 
mud blood? Or is Harry considered a pure blood, even though his 
mother´s parents were ( I think) muggles? Or would he be a half-blood 
and thus could not be called a mud-blood?????HELP!!!!!

Which brings me to my next question...just kidding.