First…………….Pure wizards are born from wizard families
How Are Wizards Made ? The gene for wizarding ability is w Wizards have two ww genes
The Malfoys Lucius Malfoy ( ww ) Narcissa Malfoy ( ww ) Draco Malfoy ( ) The Malfoys are a ‘pure blood’ family. From the past all their ancestors have been wizards so they must have the wizarding genes ww w w
Lily Potter ( ww ) James Potter ( ww ) Harry Potter ( WW ) Both Harry’s parents had magical ability so they must both have been ww –like all wizards They passed these genes on to Harry The Potters w w
The Weasleys are pure blood wizards so they all have the genes ww too
A special thing about the wizarding gene w (the gene to make a wizard) is recessive so you can only be a wizard if you have two w genes Remember, you get two copies of every gene
What about Muggles? Muggles have the other kind of gene - DOMINANT
How Are Muggles Made ? The gene for muggleness is M Muggles have the genes Mw or MM
How do you get wizards or witches from muggle families?
Hermione is a powerful witch so she But, both her parents are muggles so they must be Mm so they can give her a w gene each Mw ww
More examples from Harry Potter Next…………….Half-bloods
Tom Riddle is a ‘half blood’. His mother was a witch ( ww ) and his father was a muggle His father must have had the genes Mw so he could give him the other w gene ww Mw
More examples from Harry Potter Next…………….Muggles born in Wizard families
Filch is a ‘squib’ Both his parents are wizards (ww) so he should be too because he can’t get an M gene from either parent but he can’t do any magic This means he has a MUTATION so his wizarding powers don’t work! FILCH
In other words, his wizarding gene w has broken!